| Oa is for oath. |
| Ob is for obligation and obtain. |
| Oc is for occasional(a) and occupy. |
| Od is for odor. |
| Of is for often and of all time. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old woman. |
| Om is for omit. |
| On is for on the job(p), once more and on the other hand. |
| Op is for open and opera. |
| Or is for origin and ordering. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for outdistance and outstanding. |
| Ov is for overpayment and over. |
| Ow is for own. |
| Ox is for oxen. |
| Oy is for oyabun. |
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