| Oa is for oath. |
| Ob is for obviously, observation and observer. |
| Oc is for occasionally. |
| Od is for odor. |
| Of is for of age(p). |
| Oh is for ohio. |
| Oi is for oily. |
| Ol is for old maid and older. |
| Om is for ominous. |
| On is for on paper. |
| Op is for opposite, optimum and opinion. |
| Or is for orange, order and orange. |
| Os is for ossification. |
| Ot is for other(a). |
| Ou is for outstanding and outer(a). |
| Ov is for overall, overhear and overlap. |
| Ow is for own(a). |
| Ox is for oxide. |
| Oy is for oyabun. |
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