| Oa is for oath. |
| Ob is for object. |
| Oc is for occupation. |
| Od is for odd. |
| Of is for offer, of a sudden and officer. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old woman. |
| Om is for omit. |
| On is for on the contrary. |
| Op is for opening and optimum. |
| Or is for oral. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for outer(a). |
| Ov is for overcast. |
| Ow is for own. |
| Ox is for oxygen. |
| Oy is for oyabun. |
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