| Oa is for oath. |
| Ob is for oblige, observation and obstacle. |
| Oc is for ocean, occupational and occupation. |
| Od is for odd. |
| Of is for off and officiate. |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old maid and old woman. |
| Om is for ominous. |
| On is for one hundred and on paper. |
| Op is for opposite, opportunity and operate. |
| Or is for orderly and ordering. |
| Os is for ossification. |
| Ot is for other than. |
| Ou is for out of sight and output. |
| Ov is for over(p) and over(p). |
| Ow is for ownership. |
| Ox is for oxide. |
| Oy is for oyabun. |
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