15-Letter Words Starting with I

All 93 fifteen-letter words that start with I

ID

• identifiability24n. The quality of being identifiable.

IM

• immortalization28n. The act of immortalizing, or state of being immortalized.
• immunochemistry29n. The study of the structure of antibody molecules (immunoglobulins) and...
• immunocompetent25adj. Having a functioning immune system.
• immunodeficient25adj. Exhibiting immunodeficiency.
• immunologically25adv. Using immunological methods.
• immunomodulator22n. A drug used for its effect on the immune system.
• immunopathology28n. The branch of immunology that studies the relation of the immune system...
• immunophenotype29n. The immunological and genetic characteristics of an organism.
• impenetrability24n. The characteristic of being impenetrable; invulnerability.
• impressionistic21adj. Pertaining to or characterized by impressionism.
• improvisational22adj. Having the nature of an improvisation.

IN

• inaccessibility24n. The quality or state of being inaccessible; inaccessibleness.
• inadmissibility23n. The state of being inadmissible.
• inapplicability26n. The state of being inapplicable.
• inappropriately24adv. In an inappropriate manner.
• inattentiveness18n. The property of being inattentive.
• incommensurable23adj. Having a ratio that is not expressible as a fraction of two integers.
• incomparability26n. The condition of being incomparable.
• incompatibility26n. The quality or state of being incompatible; inconsistency...
• incomprehension24n. Lack of comprehension or understanding; inability to understand.
• inconsequential26adj. Having no consequence; not consequential; of little importance.
• inconsiderately21adv. In an inconsiderate manner; without consideration for others.
• inconsideration18n. Lack of due consideration; inattention to consequences, thoughtlessness.
• inconspicuously24adv. In an inconspicuous manner; so as not to attract attention or appear...
• indemnification23n. The act or process of indemnifying, preserving, or securing against...
• indeterminately21adv. In an indeterminate manner.
• indeterministic20adj. Not deterministic; containing randomness.
• indissolubility21n. The quality or state of being indissoluble.
• individualistic22adj. More interested in individual people than in society as a whole.
• industrializing26adj. That is undergoing industrialisation; becoming more industrial.
• industriousness16n. The quality of being industrious.
• ineffectiveness26n. The condition of being ineffective.
• infantilization27n. The act or process of infantilizing, treating a non-infant as an...
• infinitesimally23adv. In an infinitesimal manner.
• informationally23adv. In an informational manner.
• informativeness23n. The condition of being informative; clarity.
• infrastructural20adj. Of, relating to or originating in infrastructure.
• inquisitiveness27n. The quality of being inquisitive; curiosity.
• insignificantly24adv. In an insignificant manner, or to a degree that does not matter.
• inspirationally20adv. In an inspirational manner.
• instantaneously18adv. Without any delay; in an instantaneous manner.
• institutionally18adv. In an institutional manner.
• instrumentalism19n. In the philosophy of science, the view that concepts and theories are...
• instrumentalist17n. One who plays a musical instrument, as distinguished from a vocalist.
• instrumentality20n. The condition or quality of being instrumental; being useful; serving a...
• instrumentation17n. The act of using or adapting as an instrument; a series or combination...
• insubordination18n. The quality or state of being insubordinate; disobedience to lawful...
• insurrectionary20adj. Pertaining to, or characterized by, insurrection.
• insurrectionist17n. A person who provokes or takes part in an insurrection.
• intellectualism19n. The use or development of the intellect.
• intellectualist17n. An adherent of one of the forms of intellectualism.
• intellectuality20n. The characteristic of being intellectual; intellectual ability.
• intellectualize26v. To treat in an intellectual manner; to discuss or express...
• intelligibility21n. That which is intelligible; the degree to which something is...
• intensification20n. The act or process of intensifying, or of making more intense.
• interchangeable23adj. Freely substitutable; that may be swapped at will.
• interchangeably26adv. With the ability of being interchanged or swapped.
• intercollegiate18adj. Between colleges.
• intercomparison21n. A comparison made between diverse elements.
• interconnection19n. A connection (physical or logical) between multiple things.
• interconversion20n. Reciprocal or mutual conversion.
• interdependence21n. The condition of being interdependent.
• interdependency24n. A mutual dependence, connection or correlation.
• interestingness16n. The state or quality of being interesting.
• interferometric22adj. Of or pertaining to interferometry or interferometers.
• interfraternity21adj. Between fraternities.
• interindividual20adj. Occurring between individuals.
• interlaboratory20adj. Involving cooperation between laboratories.
• intermodulation18n. Modulation of the different frequencies of interacting waves.
• internalization24n. The process of internalizing something.
• internationally18adv. In an international manner.
• interpersonally20adv. In an interpersonal way.
• interphalangeal21adj. Between phalanges, as with an interphalangeal joint.
• interprovincial22adj. Occurring or existing between provinces.
• interrogatively22adv. In an interrogative manner; by means of a question.
• interscholastic22adj. Involving two or more schools.
• intersubjective29adj. Involving or occurring between separate conscious minds.
• intertextuality25n. The idea that a given text is a response to what has already been...
• interuniversity21adj. Existing or taking place between universities.
• interventionism20n. The political practice of intervening in a sovereign state's affairs.
• interventionist18adj. Of or pertaining to interventionism, or an advocate thereof.
• intracellularly20adv. In an intracellular manner.
• intraepithelial20adj. Within the epithelium.
• intraindividual20adj. Occurring within an individual.
• intramuscularly22adv. In an intramuscular manner; within a muscle; into a muscle.
• intraperitoneal17adj. Within the cavity of the peritoneum.
• introspectively25adv. In an introspective manner.
• intussusception19n. The invagination of one portion of a tubular anatomical structure...
• investigational19adj. Of, or relating to investigating, or to an investigation.
• invulnerability23n. The state of being invulnerable.

IR

• irresistibility20n. The quality of being irresistible.
• irreversibility23n. The quality of being irreversible; the lack of an ability to be...

Questions about these words

How many fifteen-letter words that start with I are there?

Word.ws lists 93 fifteen-letter words that start with I, plus 844 rare ones.

What are common fifteen-letter words that start with I?

internationally, instrumentation, interchangeable, inappropriately, instantaneously, interchangeably, inconsequential and interconnection.

Which of the fifteen-letter words that start with I has the highest letter score?

intersubjective scores 29 points with the standard letter tile values.

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