All Words: oreo, Ono, oso, Oto, Ohio, oregano, Orlando, onto, Ontario, ouzo, ogo, olio, oao, Orinoco, ostinato, outdo, oratorio, orzo, oleo, oeo, Ofo, obbligato, obligato, outgo, overgo, octavo, Oslo, overdo, Oviedo, Osasco, Oporto, Owensboro, osmo, Orono, ovolo, ocotillo, octodecimo, Orozco, ofunato, oshiwambo, oshikoto, and optimismo
| Word | Length | Vowels | Syllables | |||
|---|---|---|---|---|---|---|
| Oreo | 4 | 1 | 3 | 2 | Latin | |
| Ono | 3 | 1 | 2 | 2 | ||
| Oso | 3 | 1 | 2 | 2 | Latin | |
| Oto | 3 | 1 | 2 | 2 | ||
| Ohio | 4 | 1 | 3 | 3 | Seneca | |
| Oregano | 7 | 3 | 4 | 4 | Ancient Greek | |
| Orlando | 7 | 4 | 3 | 3 | ||
| Onto | 4 | 2 | 2 | 2 | ||
| Ontario | 7 | 3 | 4 | 4 | Wyandot | |
| Ouzo | 4 | 1 | 3 | 2 | Greek | |
| Ogo | 3 | 1 | 2 | 2 | ||
| Olio | 4 | 1 | 3 | 3 | Spanish | |
| Oao | 3 | 0 | 3 | 2 | ||
| Orinoco | 7 | 3 | 4 | 4 | ||
| Ostinato | 8 | 4 | 4 | 4 | Italian | |
| Outdo | 5 | 2 | 3 | 2 | ||
| Oratorio | 8 | 3 | 5 | 5 | Italian | |
| Orzo | 4 | 2 | 2 | 2 | Italian | |
| Oleo | 4 | 1 | 3 | 2 | Latin | |
| Oeo | 3 | 0 | 3 | 2 | ||
| Ofo | 3 | 1 | 2 | 2 | ||
| Obbligato | 9 | 5 | 4 | 4 | Italian | |
| Obligato | 8 | 4 | 4 | 4 | ||
| Outgo | 5 | 2 | 3 | 2 | Middle English | |
| Overgo | 6 | 3 | 3 | 3 | Middle English | |
| Octavo | 6 | 3 | 3 | 3 | Latin | |
| Oslo | 4 | 2 | 2 | 2 | Norwegian | |
| Overdo | 6 | 3 | 3 | 3 | ||
| Oviedo | 6 | 2 | 4 | 3 | ||
| Osasco | 6 | 3 | 3 | 3 | ||
| Oporto | 6 | 3 | 3 | 3 | Portuguese | |
| Owensboro | 9 | 5 | 4 | 4 | ||
| Osmo | 4 | 2 | 2 | 2 | ||
| Orono | 5 | 2 | 3 | 3 | ||
| Ovolo | 5 | 2 | 3 | 3 | Italian | |
| Ocotillo | 8 | 4 | 4 | 4 | Spanish | |
| Octodecimo | 10 | 5 | 5 | 5 | Latin | |
| Orozco | 6 | 3 | 3 | 3 | ||
| Ofunato | 7 | 3 | 4 | 4 | ||
| Oshiwambo | 9 | 5 | 4 | 4 | ||
| Oshikoto | 8 | 4 | 4 | 4 | ||
| Optimismo | 9 | 5 | 4 | 5 |
Prefix: o-. Suffix: -o. List of words that begin like o / start with o and end with o.

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