| Oa is for oath. |
| Ob is for observation, obstacle and observer. |
| Oc is for occupant. |
| Od is for odor. |
| Of is for office. |
| Oh is for ohio. |
| Oi is for oil. |
| Ol is for older and old testament. |
| Om is for ominous. |
| On is for on the job(p), on the other hand and once again. |
| Op is for operate. |
| Or is for ordinarily. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for outfielder and outlook. |
| Ov is for overlook and oval. |
| Ow is for owner. |
| Ox is for oxidation. |
| Oy is for oyabun. |
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