Page 1: one, over, out, once, open, ore, ope, ONI, oven, other, oe, ola, oil, oxygen, oat, oink, organ, ology, oi, often, oak, order, Oscar, oud, oar, object, Ono, oso, ode, offer, Owen, otter, ought, obi, Oto, Oman, oral, oof, Oran, orphan, oath, our, oaf, oval, ostrich, older, oyster, owe, otic, and orbit
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| One | 3 | 1 | 2 | 1 | Middle English | |
| Over | 4 | 2 | 2 | 2 | Old English | |
| Out | 3 | 1 | 2 | 1 | Old English | |
| Once | 4 | 2 | 2 | 1 | Middle English | |
| Open | 4 | 2 | 2 | 2 | Middle English | |
| Ore | 3 | 1 | 2 | 2 | Middle English | |
| Ope | 3 | 1 | 2 | 2 | ||
| ONI | 3 | 1 | 2 | 2 | ||
| Oven | 4 | 2 | 2 | 2 | Middle English | |
| Other | 5 | 3 | 2 | 2 | Middle English | |
| Oe | 2 | 0 | 2 | 1 | Danish | |
| Ola | 3 | 1 | 2 | 2 | Old Irish | |
| Oil | 3 | 1 | 2 | 1 | Middle English | |
| Oxygen | 6 | 4 | 2 | 3 | French | |
| Oat | 3 | 1 | 2 | 1 | Middle English | |
| Oink | 4 | 2 | 2 | 1 | ||
| Organ | 5 | 3 | 2 | 2 | Latin | |
| Ology | 5 | 3 | 2 | 3 | ||
| Oi | 2 | 0 | 2 | 1 | ||
| Often | 5 | 3 | 2 | 2 | Old English | |
| Oak | 3 | 1 | 2 | 1 | Middle English | |
| Order | 5 | 3 | 2 | 2 | Middle English | |
| Oscar | 5 | 3 | 2 | 2 | Irish | |
| Oud | 3 | 1 | 2 | 1 | Arabic | |
| Oar | 3 | 1 | 2 | 1 | Old English | |
| Object | 6 | 4 | 2 | 2 | Latin | |
| Ono | 3 | 1 | 2 | 2 | ||
| Oso | 3 | 1 | 2 | 2 | Latin | |
| Ode | 3 | 1 | 2 | 2 | Ancient Greek | |
| Offer | 5 | 3 | 2 | 2 | Middle English | |
| Owen | 4 | 2 | 2 | 2 | Welsh | |
| Otter | 5 | 3 | 2 | 2 | Old English | |
| Ought | 5 | 3 | 2 | 1 | Old English | |
| Obi | 3 | 1 | 2 | 2 | Japanese | |
| Oto | 3 | 1 | 2 | 2 | ||
| Oman | 4 | 2 | 2 | 2 | ||
| Oral | 4 | 2 | 2 | 2 | New Latin | |
| Oof | 3 | 1 | 2 | 1 | French | |
| Oran | 4 | 2 | 2 | 2 | Irish | |
| Orphan | 6 | 4 | 2 | 2 | Late Latin | |
| Oath | 4 | 2 | 2 | 1 | Middle English | |
| Our | 3 | 1 | 2 | 1 | Middle English | |
| Oaf | 3 | 1 | 2 | 1 | Old Norse | |
| Oval | 4 | 2 | 2 | 2 | ||
| Ostrich | 7 | 5 | 2 | 2 | Anglo Norman | |
| Older | 5 | 3 | 2 | 2 | Old Norse | |
| Oyster | 6 | 4 | 2 | 2 | Old English | |
| Owe | 3 | 1 | 2 | 1 | Middle English | |
| Otic | 4 | 2 | 2 | 2 | Ancient Greek | |
| Orbit | 5 | 3 | 2 | 2 | Latin |
Prefix: o-. List of words that begin like o / start with o.

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