| Oa is for oath. |
| Ob is for obey and obligation. |
| Oc is for occasion. |
| Od is for odd. |
| Of is for of age(p) and of age(p). |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for older. |
| Om is for omit. |
| On is for one(a), on the one hand and one-half. |
| Op is for operator. |
| Or is for order and orchestra. |
| Os is for ossification. |
| Ot is for other(a). |
| Ou is for outlook and outfielder. |
| Ov is for overthrow, over and over and overhear. |
| Ow is for ownership. |
| Ox is for oxygen. |
| Oy is for oyabun. |
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