Page 1: on, own, open, oven, oxygen, ocean, organ, onion, often, option, organization, Orion, Owen, Oman, orangutan, Oran, Oregon, orphan, origin, oppression, obsession, ovation, orientation, Oken, occasion, ottoman, omen, oration, octagon, Odin, omicron, opposition, observation, oxymoron, occupation, obstruction, optician, opinion, operation, oblivion, ophidian, organisation, occlusion, octillion, obsidian, oarsman, obligation, overreaction, ostentation, and Octavian
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| On | 2 | 1 | 1 | 1 | Middle English | |
| Own | 3 | 2 | 1 | 1 | Middle English | |
| Open | 4 | 2 | 2 | 2 | Middle English | |
| Oven | 4 | 2 | 2 | 2 | Middle English | |
| Oxygen | 6 | 4 | 2 | 3 | French | |
| Ocean | 5 | 2 | 3 | 2 | Old French | |
| Organ | 5 | 3 | 2 | 2 | Latin | |
| Onion | 5 | 2 | 3 | 2 | Middle English | |
| Often | 5 | 3 | 2 | 2 | Old English | |
| Option | 6 | 3 | 3 | 2 | French | |
| Organization | 12 | 6 | 6 | 5 | ||
| Orion | 5 | 2 | 3 | 2 | Middle English | |
| Owen | 4 | 2 | 2 | 2 | Welsh | |
| Oman | 4 | 2 | 2 | 2 | ||
| Orangutan | 9 | 5 | 4 | 4 | Malay | |
| Oran | 4 | 2 | 2 | 2 | Irish | |
| Oregon | 6 | 3 | 3 | 3 | ||
| Orphan | 6 | 4 | 2 | 2 | Late Latin | |
| Origin | 6 | 3 | 3 | 3 | Middle English | |
| Oppression | 10 | 6 | 4 | 3 | Middle English | |
| Obsession | 9 | 5 | 4 | 3 | Latin | |
| Ovation | 7 | 3 | 4 | 3 | Latin | |
| Orientation | 11 | 5 | 6 | 5 | ||
| Oken | 4 | 2 | 2 | 2 | ||
| Occasion | 8 | 4 | 4 | 3 | Old French | |
| Ottoman | 7 | 4 | 3 | 3 | ||
| Omen | 4 | 2 | 2 | 2 | Latin | |
| Oration | 7 | 3 | 4 | 3 | Latin | |
| Octagon | 7 | 4 | 3 | 3 | Latin | |
| Odin | 4 | 2 | 2 | 2 | Old Norse | |
| Omicron | 7 | 4 | 3 | 3 | ||
| Opposition | 10 | 5 | 5 | 4 | Old French | |
| Observation | 11 | 6 | 5 | 4 | Latin | |
| Oxymoron | 8 | 5 | 3 | 4 | Latin | |
| Occupation | 10 | 5 | 5 | 4 | Middle English | |
| Obstruction | 11 | 7 | 4 | 3 | Latin | |
| Optician | 8 | 4 | 4 | 4 | ||
| Opinion | 7 | 3 | 4 | 3 | Middle English | |
| Operation | 9 | 4 | 5 | 4 | Latin | |
| Oblivion | 8 | 4 | 4 | 3 | Anglo Norman | |
| Ophidian | 8 | 4 | 4 | 4 | Latin | |
| Organisation | 12 | 6 | 6 | 5 | ||
| Occlusion | 9 | 5 | 4 | 3 | Latin | |
| Octillion | 9 | 5 | 4 | 3 | ||
| Obsidian | 8 | 4 | 4 | 4 | ||
| Oarsman | 7 | 4 | 3 | 2 | ||
| Obligation | 10 | 5 | 5 | 4 | Proto Indo European | |
| Overreaction | 12 | 6 | 6 | 4 | ||
| Ostentation | 11 | 6 | 5 | 4 | Middle English | |
| Octavian | 8 | 4 | 4 | 4 | Latin |
Prefix: o-. Suffix: -n. List of words that begin like o / start with o and end with n.

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