| Oa is for oath. |
| Ob is for observer. |
| Oc is for occupied and occupation. |
| Od is for odor. |
| Of is for officiate and offset. |
| Oh is for ohio. |
| Oi is for oil. |
| Ol is for old(a). |
| Om is for ominous. |
| On is for one by one and only. |
| Op is for open and openly. |
| Or is for organification and orbit. |
| Os is for ossification. |
| Ot is for other(a). |
| Ou is for oust. |
| Ov is for over(p) and overlap. |
| Ow is for owner. |
| Ox is for oxen. |
| Oy is for oyabun. |
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