Words That Start with ON

2-letter words that start with ON

• on2adj. In the state of being active, functioning or operating.

3-letter words that start with ON

• onc5n. Oncology.
• one3pron. One thing (among a group of others); one member of a group.
• oni3n. A Japanese evil spirit or demon.
• ono3adj. Good-tasting, delicious.
• onz12adj. Taking place.

4-letter words that start with ON

• once6adv. One and only one time.
• onde5n. Breath.
• oneg5n. A casual festive gathering on Friday night after the first Shabbat...
• onek8n. A One-pronged fork.
• oner4n. An extraordinary individual or thing.
• ones4n. A senior or first team (as opposed to a reserves team).
• ongo5v. To be ongoing (occurring, happening); to last, proceed or continue.
• only7adj. Alone in a category.
• onos4n. Synonym of epinetron (“Attic pottery item”).
• onto4prep. Arriving upon or on top of (speaking of a physical or metaphorical...
• onus4n. A legal obligation.
• onya7interj. Good on you.
• onyx14n. A banded variety of chalcedony, a cryptocrystalline form of quartz.
• onza13n. A traditional Spanish unit of mass, equivalent to about 28.76 g.

5-letter words that start with ON

• onaga6n. Longtail snapper (Etelis coruscans), a species of ray-finned fish.
• onion5n. A monocotyledonous plant (Allium cepa), allied to garlic, used as...
• onium7n. Any cation derived by the addition of a proton to the hydride of any...
• onlay8v. To lay or place something on a surface.
• onsen5n. A (Japanese) hot spring.
• onset5n. The initial phase of a disease or condition, in which symptoms first...
• ontic7adj. Ontological.

6-letter words that start with ON

• onager7n. The Asiatic wild ass or hemione (Equus hemionus), an animal of the...
• onesie6n. A one-piece garment for an infant or small child, generally worn over a...
• oniony9adj. Resembling an onion or onions, especially in terms of smell.
• online6adj. Of a generator or power plant: connected to the grid.
• onload7v. To load onto or upon.
• onrush9n. A forceful rush or flow forward.
• onside7adj. Not in an offside position; in the part of the playing area where one...
• onsite6adj. On or at a site.
• ontake10v. To take on; undertake; assume.
• onward10adj. Moving forward.

7-letter words that start with ON

• onanism9n. Masturbation.
• onboard10adj. Carried or used on or in a vehicle or vessel.
• oneiric9adj. Of or pertaining to dreams.
• oneness7n. The state of being one or undivided; unity.
• onerous7adj. Imposing or constituting a physical, mental, or figurative load which...
• oneshot10v. To kill or destroy with a single hit; to instakill.
• onesies7n. A call in any children's game, such as jacks, where one action must be...
• onfield11adj. That takes place on a sports field.
• ongoing9adj. Continuing, permanent, lasting.
• onigiri8n. A Japanese food made by putting ingredients into white rice, wrapping...
• onshore10adj. Moving from the sea towards the land.
• onsight11adj. Without having previously seen the terrain.
• onstage8adj. On the part of a stage that is visible to the audience.
• onwards11adv. Onward.

8-letter words that start with ON

• oncidium13n. Any of the genus Oncidium of tropical orchidaceous plants.
• oncogene11n. Any gene that contributes to the conversion of a normal cell into a...
• oncology14n. The branch of medicine concerned with tumors, including study of their...
• oncoming13n. Approach, onset.
• onlooker12n. One who looks on or watches, without becoming involved or...
• onscreen10adj. As seen on a screen (as of television, film, or computer) rather than...
• onstream10adj. Being produced.
• ontogeny12n. Synonym of ontogenesis.
• ontology12n. The branch of metaphysics that addresses the nature or essential...

9-letter words that start with ON

• oncogenic14adj. Causing the formation of tumors.
• oncologic14adj. Of or pertaining to oncology.
• oncolytic16adj. That breaks up cancer cells.
• onionskin13n. A thin, strong, light, translucent paper; used especially for making...
• onlooking14adj. That is looking on; watching, observing.
• onomastic13adj. Of or relating to a personal or place name.
• onrushing13adj. Rushing or flowing forward.
• onslaught13n. A fierce attack.

10-letter words that start with ON

• onboarding14n. The process of bringing a new employee on board, incorporating training...
• oncologist13n. A doctor or scientist who specializes in oncology.
• onomastics14n. The branch of lexicology devoted to the study of names and naming...

11-letter words that start with ON

• oncogenesis14n. The formation and development of tumors.
• oncological16adj. Of or pertaining to oncology.
• oncoprotein15n. A protein that is coded for by an oncogene.
• ondansetron12n. A carbazole derivative (trademark Zofran), C₁₈H₁₉N₃O, that is a...
• onomasticon15n. A book, list, or vocabulary of names, especially of people.
• ontogenesis12n. The generation and development of an individual organism from...
• ontogenetic14adj. Of or relating to ontogenesis.
• ontological14adj. Of or relating to ontology.

12-letter words that start with ON

• onomatopoeia16n. The property of a word that sounds like what it represents.
• onomatopoeic18adj. Of or relating to onomatopoeia.

13-letter words that start with ON

• onomatopoetic19adj. Synonym of onomatopoeic.
• ontologically19adv. In an ontological manner.
• onychomycosis28n. Fungal infection of the nail, especially the toenail.

14-letter words that start with ON

• onchocerciasis23n. A disease caused by a worm of the genus Onchocerca, especially as...

15-letter words that start with ON

• ontogenetically21adv. Synonym of ontogenically.

Questions about these words

How many words that start with ON are there?

Word.ws lists 86 words that start with ON, plus 399 rare ones.

What are common words that start with ON?

on, one, only, once, online, ones, onto and ongoing.

Which of the words that start with ON has the highest letter score?

onychomycosis scores 28 points with the standard letter tile values.

Related word lists

• Words That Start with O
• Words Ending in ON
• Q Words Without U