| Oa is for oath. |
| Ob is for obey, obvious and obstruction. |
| Oc is for occupy. |
| Od is for odd. |
| Of is for off and offset. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old, old and old testament. |
| Om is for ominous. |
| On is for on the way, once and on request. |
| Op is for opium and opium. |
| Or is for oriental and originate. |
| Os is for ossification. |
| Ot is for otherwise. |
| Ou is for oust, outfit and outcome. |
| Ov is for overpayment. |
| Ow is for owe. |
| Ox is for oxidation. |
| Oy is for oyabun. |
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