| Oa is for oath. |
| Ob is for observe. |
| Oc is for occupational, ocean and occasional(a). |
| Od is for odd. |
| Of is for of course. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for olympic, older and older. |
| Om is for omit. |
| On is for only, on hand(p) and on the other hand. |
| Op is for optimum, opium and opium. |
| Or is for originate and or else. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for outweigh, out of sight and outside. |
| Ov is for overpayment. |
| Ow is for owe. |
| Ox is for oxygen. |
| Oy is for oyabun. |
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