| Oa is for oath. |
| Ob is for obstacle and obligation. |
| Oc is for occasionally, occasion and occupation. |
| Od is for odd. |
| Of is for of all time, of age(p) and official. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old woman. |
| Om is for ominous. |
| On is for on the whole. |
| Op is for optical. |
| Or is for ordinary. |
| Os is for ossification. |
| Ot is for other(a). |
| Ou is for ounce. |
| Ov is for overhear. |
| Ow is for own(a). |
| Ox is for oxygen. |
| Oy is for oyabun. |
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