| Oa is for oath. |
| Ob is for obey and observer. |
| Oc is for ocean, occupied and occupational. |
| Od is for odor. |
| Of is for officiate and official. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old woman. |
| Om is for omit. |
| On is for one-third, on and one(a). |
| Op is for operation and openly. |
| Or is for organification, ordinary and organization. |
| Os is for ossification. |
| Ot is for other(a). |
| Ou is for ounce, outside and out of sight. |
| Ov is for over(p). |
| Ow is for owe. |
| Ox is for oxide. |
| Oy is for oyabun. |
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