12-Letter Words Starting with A
There are 261 twelve-letter words that start with A on Word.ws, from abbreviation to azithromycin. The most common are architecture, agricultural, announcement, accidentally and additionally.
Meanings from Wiktionary. Not an official Scrabble, Words With Friends or Wordle word list.
All 261 twelve-letter words that start with A
AB
- abbreviation19n. The result of shortening or reducing; abridgment.
- aberrational14adj. Characterized by aberration.
- abolitionism16n. Support for the abolition of something; the tenets of abolitionists.
- abolitionist14adj. In favor of the abolition of any particular institution or practice.
- abrasiveness17n. The property, quality or instance of being abrasive.
- absoluteness14n. The characteristic of being absolute in nature or scope.
- absorptivity22n. The quality of being absorptive; absorptiveness.
- abstractness16n. The quality of being abstract.
AC
- academically22adv. In an academic style or way; from an academic perspective.
- acanthamoeba21n. Any amoeba of the genus Acanthamoeba, found chiefly in soil.
- accelerating17n. An act of acceleration.
- acceleration16n. The act of accelerating, or the state of being accelerated; increase of...
- accelerative19adj. Relating to acceleration; adding to velocity; quickening.
- accentuation16n. A more distinct or prominent form.
- accessorized26adj. Wearing or equipped with accessories.
- accidentally20adv. In an accidental manner; by chance, unexpectedly.
- acclimatized28adj. Having undergone acclimatization.
- accompanying24adj. Present together.
- accomplished24adj. Completed; effected; established.
- accordionist17n. Someone who plays the accordion.
- accouchement23n. Delivery in childbed; parturition.
- accoutrement18n. A soldier's equipment, other than weapons and uniform.
- accretionary19adj. Of, pertaining to, or in the form of an accretion.
- acculturated17adj. Accustomed to; familiar with.
- accumulation18n. The act of amassing or gathering, as into a pile.
- accumulative21adj. Characterized by accumulation; serving to collect or amass.
- acepromazine27n. A phenothiazine derivative antipsychotic drug.
- acetaldehyde22n. A colourless organic compound, CH₃CHO, occurring widely in nature and...
- acetoacetate16n. Any salt or ester of acetoacetic acid.
- acetonitrile14n. The simplest organic cyanide or nitrile, CH₃CN, formally derived from...
- acetophenone19n. The aromatic ketone phenyl methyl ketone, used in the manufacture of...
- acknowledged24adj. Generally accepted, recognized or admitted.
- acoustically19adv. In an acoustic manner, or using an acoustic musical instrument.
- acquaintance25n. A state of being acquainted with a person; originally indicating...
- acquiescence27n. A silent or passive assent or submission, or a submission with apparent...
- actinomycete21n. Any of various filamentous or rod-shaped bacteria, of the order...
AD
- adaptability20n. The quality of being adaptable; a quality that renders adaptable.
- adaptiveness18n. The state or quality of being adaptive; capacity to adapt.
- additionally17adv. By way of addition; in addition to; also.
- adhesiveness19n. The quality of being, or the degree to which a thing is, adhesive.
- adipogenesis16n. The formation of fatty tissue; lipogenesis.
- adjectivally28adv. As, or in the manner of, an adjective.
- adjudication23n. The act of adjudicating, of reaching a judgement.
- adjudicative26adj. Of or pertaining to an adjudication or to an adjudicator.
- adjudicatory26adj. Of or pertaining to an adjudication.
- administrate15v. To administer.
- admonishment20n. The act of admonishing.
- adorableness15n. The state or quality of being adorable.
- adrenoceptor17n. Adrenergic receptor.
- adrenochrome20n. An oxidation product of adrenaline or epinephrine; its semicarbazone is...
- adulteration13n. The process of adulterating.
- advantageous17adj. Being of advantage, beneficial.
- adventitious16adj. From an external source; not innate or inherent, foreign.
- advisability21n. The quality of being advisable or prudent.
AE
- aerodynamics20n. The science of the dynamics of bodies moving relative to gases...
- aeromagnetic17adj. Of or pertaining to aeromagnetics.
- aeronautical14adj. Of or pertaining to the scientific study of flight.
- aerotropolis14n. A city that has grown up around a pre-existing airport.
- aesthetician17n. One who studies aesthetics; a student of art or beauty.
- aestheticism19n. A doctrine which holds aesthetics or beauty as the highest ideal or...
AF
- affectionate20adj. Having affection or warm regard; loving; fond.
- aforethought22adj. Premeditated; planned ahead of time.
- afterburning18n. The injection of extra fuel into a jet engine downstream of the...
- afterthought22n. A reflection after an act; a later or subsequent thought, action, or...
AG
- aggrandizing25n. Synonym of aggrandization.
- aggressively20adv. In an aggressive manner.
- aggressivity20n. The quality of being aggressive.
- agribusiness15n. Business (especially big business) connected to agriculture, either...
- agricultural15adj. Of or pertaining to agriculture.
- agrochemical22n. A chemical compound, such as a hormone, fungicide, or insecticide, that...
- agroforestry19n. An agricultural approach of using the interactive benefits from...
AI
- airbreathing18adj. Using the air from the atmosphere for combustion.
- airtightness16n. The quality of being airtight.
AL
- algorithmics20n. The subdiscipline of informatics or computer science that studies...
- alimentation14n. Alimony.
- allegorizing23n. The act or process of making an allegory.
- allelopathic19adj. Relating to an allelopathy.
- alliteration12n. The repetition of consonant sounds or letters at the beginning of two...
- alliterative15adj. In the form or style of alliteration.
- alphabetical21adj. Pertaining to, furnished with, or expressed by letters of the alphabet.
- alphabetized29adj. American and Oxford British standard spelling of alphabetised.
- alphanumeric21adj. Consisting of, or limited to, letters and/or numbers, especially the...
- alstroemeria14n. Any member of the genus Alstroemeria of South American flowering...
AM
- amalgamation17n. The process of amalgamating; a mixture, merger or consolidation.
- amateurishly20adv. In an amateurish manner; without expertise or professionalism.
- ambassadress17n. A female ambassador.
- ambidextrous24adj. Having equal or comparable ability in both hands; in particular, able...
- ambivalently22adv. In an ambivalent manner.
- amelioration14n. The act of making better.
- ameliorative17adj. Able to repair or ameliorate.
- aminobenzoic27adj. Of or pertaining to aminobenzoic acid or its derivatives.
- aminobutyric21adj. Of or pertaining to any of several isomeric univalent radicals in which...
- amortization23n. The reduction of loan principal over a series of payments.
- amperometric20adj. That involves measurement of an electric current during a process such...
- amphictyonic26adj. Of or relating to the amphictyons or their League or Council.
- amphitheater22n. American form of amphitheatre.
- amphitheatre22n. An open, outdoor theatre (which may be a theatre in the round, or have...
- amphotericin21n. Any of a group of amphoteric antibiotic and antifungal agents derived...
AN
- anaesthetics17n. The field of anaesthesiology.
- anagrammatic19adj. Being or relating to an anagram.
- analogically18adv. In an analogical manner; in the manner of an analogy.
- analytically20adv. In an analytical manner.
- anamorphosis19n. A distorted image of an object that may be viewed correctly from a...
- anaphylactic24adj. Pertaining to anaphylaxis.
- anaplasmosis16n. A disease of ruminants and sometimes humans caused by infection with...
- anastomosing15adj. Fused together in a vein-like network; used to describe mushroom gills...
- anathematize26v. To cause to be, or to declare as, an anathema or evil.
- anatomically19adv. Pertaining to the anatomy.
- androcentric17adj. Of, pertaining to, or exhibiting androcentrism; focused on males.
- androgenetic16adj. Relating to, or exhibiting, androgenesis.
- androstenone13n. A steroid, specifically 5α-androst-16-en-4-one, found in human sweat...
- androsterone13n. An androgenic hormone, excreted in the urine, somewhat less active than...
- anencephalic21adj. Of, pertaining to, or exhibiting anencephaly.
- anesthetized25adj. Subject to anesthesia.
- angiogenesis14n. The formation and development of new blood vessels.
- angiographic21adj. Of or pertaining to angiography.
- angiopoietin15n. A protein growth factor that promotes angiogenesis.
- angiosarcoma17n. Any malignant tumour of vascular tissue.
- animatronics16n. A form of robotics used to create robots that produce preset moves and...
- ankylosaurus19n. Ankylosaurus magniventris, a large herbivorous dinosaur of the...
- annihilating16adj. Causing annihilation; devastating.
- annihilation15n. The act of destroying or otherwise turning into nothing, or...
- announcement16n. An act of announcing, or giving notice.
- annoyingness16n. The quality of being annoying.
- annunciation14n. The act of annunciating.
- antagonistic15adj. Contending or acting against.
- antagonizing23adj. Tending to antagonize.
- antecedently18adv. At an earlier time.
- antediluvian16adj. Belonging or pertaining to, or existing in, the time prior to the great...
- anteromedial15adj. Located in the front and towards a middle line.
- anthelmintic19adj. Destructive to parasitic worms.
- anthranilate15n. Any salt or ester of anthranilic acid.
- anthropology21n. The scientific study of humans, systematically describing the...
- antiabortion14adj. Opposed to the practice or legalization of abortion.
- antialiasing13n. Any technique that reduces the appearance of jagged edges in digital...
- antiandrogen14n. Any substance that inhibits the release or the biological effects of an...
- anticipation16n. The act of anticipating, taking up, placing, or considering something...
- anticipative19adj. Of or pertaining to anticipation; inclined to anticipate; expectant.
- anticipatory19adj. Characterized by anticipation.
- anticlerical16adj. Opposed to political influence of clerics.
- anticolonial14adj. Opposing colonialism.
- anticyclonic21adj. Of, relating to, or consisting of an anticyclone.
- antidiabetic17adj. Countering diabetes.
- antidiuretic15n. An agent that prevents or counteracts diuresis.
- antiestrogen13n. A substance that blocks the production or utilization of estrogens, or...
- antifeminism19n. Opposition to feminism.
- antifeminist17adj. Antagonistic to feminism.
- antigenicity18n. The ability, or degree of ability, to react with the products of an...
- antihydrogen20n. The antimatter equivalent of hydrogen, consisting of an antiproton and...
- antimalarial14n. An agent that prevents or counteracts malaria.
- antimonopoly19adj. Usually with respect to laws or policies: in opposition to the creation...
- antinational12adj. Opposed to one's own nation; unpatriotic.
- antineutrino12n. The antiparticle of the neutrino.
- antiparallel14adj. Describing the orientations of the two strands of DNA.
- antiparticle16n. A subatomic particle corresponding to another particle with the same...
- antipathetic19adj. Having or showing a strong aversion or repugnance.
- antiplatelet14adj. Working against or destroying blood platelets.
- antisymmetry22n. The condition of being antisymmetric.
- antithetical17adj. Pertaining to antithesis, or opposition of words and sentiments...
- antithrombin19n. A small molecule that inactivates several enzymes of the coagulation...
AP
- apocalyptica23n. Writings which are apocalyptic or which are about an apocalypse.
- apochromatic23adj. Corrected for both chromatic aberration and spherical aberration.
- apocryphally27adv. In an apocryphal manner.
- apologetical17adj. Apologetic.
- appassionato16adv. (to be played) passionately.
- appendectomy24n. The surgical procedure for the removal of the vermiform appendix.
- appendicitis19n. Inflammation of the vermiform appendix.
- appendicular19adj. Of or pertaining to a limb or appendage.
- apperception20n. The mind's perception of itself as the subject or actor in its own...
- apperceptive23adj. Involving or relating to apperception.
- appoggiatura18n. A type of musical ornament, falling on the beat, which often creates a...
- apportioning17n. Apportionment.
- appreciating19adj. Appreciative: having or showing appreciation.
- appreciation18n. The act of appreciating.
- appreciative21adj. Showing appreciation or gratitude.
- apprehending21n. An act by which something is apprehended.
- apprehension19n. The act of seizing or taking by legal process; arrest.
- apprehensive22adj. Anticipating something with anxiety, fear, or doubt; reluctant.
- approachable23adj. Easily approached; easy to talk to.
- appropriated19adj. Set aside for a specified purpose.
- appropriator18n. A person who appropriates something.
- approximated26adj. Calculated by approximation.
- appurtenance18n. That which appertains to something else; a belonging, accompaniment...
AR
- arachidonate18n. Any salt or ester of arachidonic acid.
- archaeometry22n. The application of techniques and methodologies of the natural sciences...
- archdeaconry23n. The office of an archdeacon, or the term of that office.
- archdiocesan20adj. Of or relating to an archdiocese.
- archetypical24adj. In the way of an archetype, in the way of an idealized or most...
- archipelagic22adj. Of or pertaining to an archipelago; of the nature of an archipelago.
- architecture19n. The art and science of designing and managing the construction of...
- architeuthis20n. A giant squid (genus Architeuthis).
- argillaceous15adj. Pertaining to clay; made of, containing, or resembling clay; clayey.
- aripiprazole25n. An antipsychotic drug C₂₃H₂₇Cl₂N₃O₂ used in the treatment of...
- aristocratic16adj. Of, pertaining to, or favouring, an aristocracy.
- arithmetical19adj. Of or pertaining to arithmetic, particularly the functions of...
- aromatherapy22n. The use of selected fragrances in lotions and inhalants in an effort to...
- arsenopyrite17n. A silvery-grey ore of arsenic, a mixed arsenide and sulfide of iron...
- arthroplasty20n. The surgical repair of a joint, or creation of an artificial joint...
- arthroscopic21adj. Of or pertaining to arthroscopy.
- articulately17adv. In an articulate manner.
- articulation14n. A joint or the collection of joints at which something is articulated...
- articulatory17adj. Of or pertaining to articulation; phonetic.
- artificially20adv. In an artificial manner.
- artilleryman17n. A soldier enlisted in an artillery unit or who uses artillery.
- artistically17adv. In an artistic manner.
AS
- asparaginase15n. An enzyme that catalyzes the hydrolysis of asparagine to aspartic acid...
- asphyxiating28adj. Causing asphyxiation; depriving living beings of the ability to breathe.
- asphyxiation27n. Death due to lack of oxygen.
- aspirational14adj. Being ambitious.
- assimilating15adj. That assimilates.
- assimilation14n. The act of assimilating or the state of being assimilated.
- assimilative17adj. Tending to, or characterized by, assimilation.
- assimilatory17adj. That tends to assimilate.
- astonishment17n. The feeling or experience of being astonished; great surprise.
- astoundingly17adv. In an astounding manner; so as to astound, surprise, or amaze.
- astrobiology18n. The study of life anywhere in the universe, including Earth.
- astrological15adj. Of, or relating to astrology.
- astronautics14n. Navigation through space.
- astronomical16adj. Of or relating to astronomy.
- astrophysics22n. The branch of astronomy or physics that deals with the physical...
- astroturfing16n. The disguising of an orchestrated campaign as a "grass-roots" event...
- asymmetrical21adj. Not symmetrical.
- asymptomatic23adj. Not exhibiting any symptoms of disease, as for example in a case which...
- asynchronous20adj. Not synchronous; occurring at different times.
AT
- atheromatous17adj. Of, pertaining to, or having atheromas.
- athletically20adv. In an athletic manner.
- atmospherics21n. Radio interference caused by pulses of electromagnetic radiation in the...
- atorvastatin15n. A statin used to lower the level of cholesterol in the blood. Trade...
- attractively20adv. In an attractive manner; with the power of attracting or drawing to.
- attributable16adj. Capable of being attributed.
AU
- audiological16adj. Of or pertaining to audiology, or the study of hearing.
- audiovisuals16n. Audiovisual material.
- augmentation15n. The act or process of augmenting.
- augmentative18adj. That which augments.
- auscultation14n. Diagnosis of disorders by listening to the sounds of the internal...
- auscultatory17adj. Of or pertaining to auscultation.
- auspiciously19adv. In an auspicious way.
- authenticate17v. To render authentic; to give authority to, by the proof, attestation...
- authenticity20n. The quality of being genuine or not corrupted from the original, of...
- autoantibody18n. An antibody formed in response to an agent (autoantigen) produced by...
- autocomplete18v. To complete automatically.
- autodidactic18adj. Of, relating to, or being an autodidact; self-taught; self-educated.
- autographing19n. The signing of an autograph.
- autoignition13n. Spontaneous combustion.
- autoimmunity19n. The condition where one's immune system attacks one's own tissues...
- autoinjector21n. A medical device designed to deliver a single dose of a particular...
- automaticity19n. The ability to do things without occupying the mind with the low level...
- automobility19n. The use of automobiles as the major means of transportation and...
- automorphism21n. An isomorphism of a mathematical object or system of objects onto...
- autonomously17adv. In an autonomous or self-governing manner.
- autoreactive17adj. Acting against the organism by which it was produced.
- autorickshaw24n. A motorized rickshaw of South Asia and East Asia, often available for...
- autorotation12n. The rotation of the blades of a helicopter driven solely by the action...
- autothrottle15n. An automatic throttle, allowing a pilot to control the power setting of...
- autoxidation20n. A spontaneous oxidation reaction that results in the slow, flameless...
AV
- availability20n. The quality of being available.
AX
- axisymmetric28adj. Exhibiting symmetry around an axis; exhibiting cylindrical symmetry...
AY
- ayuntamiento17n. A corporation or body of magistrates in cities and towns in Spain...
AZ
- azadirachtin27n. An insecticide of complex structure extracted from the seeds of the...
- azathioprine26n. A purine antimetabolite immunosuppressant used in organ transplant and...
- azithromycin31n. A semisynthetic macrolide antibiotic C₃₈H₇₂N₂O₁₂ (trademarks Zithromax...
2,786 rare twelve-letter words that start with A
- aardvarklike
- abacterially
- abalienation
- abambulacral
- abasiophilia
- abathochroal
- abattoirlike
- abbreviately
- abbreviative
- abbreviatory
- abbreviature
- abdicational
- abdominalgia
- abdominalian
- abelisauroid
- abernathyite
- aberrometric
- abevacuation
- abgeschmackt
- abieslactone
- abietadienic
- abietatriene
- abiochemical
- abiogenesist
- abirritation
- abirritative
- abjectedness
- abjudication
- ablaqueation
- ablationally
- ablativeness
- ablecentrism
- abligurition
- abliteration
- ablutophilia
- ablutophobia
- ablutophobic
- abnormalness
- abolitionary
- abolitiondom
- abolitionize
- aboriginally
- abortificant
- abortiveness
- abracadabric
- abrasiometer
- abrasionally
- abrasionless
- abreactively
- abscessation
- abscissional
- absentaneous
- absenteeship
- absentiality
- absimilation
- absinthiated
- absinthismic
- absolutively
- absolutivity
- absorbedness
- absorptional
- absorptively
- absquatulate
- abstemiously
- abstinential
- abstractable
- abstractedly
- abstruseness
- abstrusively
- abusefulness
- abyssolithic
- academicking
- academicness
- acanthaceous
- acanthocytic
- acantholysis
- acantholytic
- acanthomorph
- acanthophyll
- acanthopteri
- acanthoracid
- acanthostyle
- acanthrocyte
- acanticonite
- acariphagous
- acarminative
- acarological
- acarophilous
- acarpomyxean
- acatallactic
- acategorical
- acaulescence
- acceleratory
- accelerogram
- accelerostat
- accentedness
- accentlessly
- accentologic
- accentuality
- acceptorless
- acciaccatura
- acclimatable
- acclimatizer
- accommodable
- accommodator
- accompagnato
- accompanable
- accompletive
- accomplicity
- accompliment
- accomplisher
- accomplition
- accouplement
- accouterment
- accreditable
- accreditment
- accroachment
- accumulatory
- accurateness
- accursedness
- accusatively
- accusativism
- accusativity
- accusatorial
- accusatorily
- accustomable
- accustomably
- accustomance
- accustomedly
- acecarbromal
- aceglutamide
- acellularity
- acellularize
- acenaphthene
- acenesthesia
- acentrically
- acentromeric
- acentrosomal
- acephalocyst
- acephalously
- acequinoline
- aceratheriin
- acetaldoxime
- acetatelyase
- acetergamine
- acetoacetase
- acetocarmine
- acetoclastic
- acetoclastis
- acetogenesis
- acetolactate
- acetonometer
- acetophenide
- acetosoluble
- acetosulfone
- acetotoluide
- acetotrophic
- acetoxylated
- acetylatable
- acetylizable
- acetyllysine
- acetyltannic
- acetyltannin
- achatinellid
- achillodynia
- achlamydeous
- achlorhydria
- achlorhydric
- achluophobia
- achluophobic
- acholeplasma
- achrodextrin
- achromatinic
- achromatopia
- achromatosis
- achromaturia
- achromoderma
- achromosomal
- achtaragdite
- achyranthoid
- acidaminuria
- acidlessness
- acidobiontic
- acidochromic
- acidogenesis
- acidophilous
- acidotically
- acidotrophic
- acinonodular
- acinotubular
- acipenserine
- acipenseroid
- acireductone
- ackamarackus
- acknowledger
- acmonidesite
- acokantherin
- acolutholect
- acontractile
- acousticness
- acoustooptic
- acquaintable
- acquaintancy
- acquiescency
- acridivorous
- acridologist
- acridophagus
- acroamatical
- acroasphyxia
- acrocallosal
- acrocephalia
- acrocephalic
- acrocephalid
- acrochordoid
- acrocoracoid
- acrocyanosis
- acrocyanotic
- acrodactylum
- acrogenously
- acrolectally
- acroleinated
- acromegaliac
- acromegaloid
- acromelalgia
- acromelanism
- acromyotonia
- acromyotonus
- acronarcotic
- acronychally
- acronymously
- acrophonetic
- acrophonical
- acrosomeless
- acrostealgia
- acrosternite
- acrostically
- acrostichoid
- acrosyndesis
- acroteleutic
- acrotrichial
- acrotrichium
- actinenchyma
- actiniferous
- actinioidean
- actinobolism
- actinobranch
- actinoceroid
- actinocyclid
- actinodontid
- actinofibril
- actinography
- actinoleukin
- actinolichen
- actinologist
- actinologous
- actinometric
- actinomorphy
- actinomycoma
- actinomyosin
- actinophonic
- actinophryan
- actinophryid
- actinoquinol
- actinorhizal
- actinorhodin
- actinosporin
- actinostelic
- actinostolid
- actinostomal
- actinotrocha
- activational
- activization
- actorishness
- actualizable
- acufenometry
- aculeatiside
- aculturality
- acupunctuate
- acupunctural
- acutifoliate
- acutilingual
- acyclicality
- acylceramide
- acylglycerol
- acylimmonium
- acylindrical
- acylpyrazole
- acylpyridine
- acylthiourea
- acytokinetic
- adamantanoid
- adamantanone
- adamantinely
- adamantinoma
- adambulacral
- adambulacrum
- adapisoricid
- adaptational
- adaptatively
- adaptativity
The first 300 are shown.
Questions about these words
- How many twelve-letter words that start with A are there?
- Word.ws lists 261 twelve-letter words that start with A, plus 2,786 rare ones.
- What are common twelve-letter words that start with A?
- architecture, agricultural, announcement, accidentally, additionally, accomplished, availability and appreciation.
- Which of the twelve-letter words that start with A has the highest letter score?
- azithromycin scores 31 points with the standard letter tile values.
Related word lists
Source and license
Word lists and meanings adapted from the Wiktionary entry of each word. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out names, abbreviations, misspellings and offensive words, and ordered the most common words by how often they appear in English (wordfreq). Meanings from Wiktionary; this is not an official Scrabble, Words With Friends or Wordle word list. Wiktionary data of 2026-09-02.
Cite this page: “12-Letter Words Starting with A: 261 Words.” Word.ws, https://word.ws/words/12-letter/starting-with-a. Based on Wiktionary, CC BY-SA 4.0.