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Oa is for oath.
Ob is for objective, obstacle and observed.
Oc is for occupational, occupation and occur.
Od is for odd.
Of is for of a sudden, off and office.
Oh is for ohio.
Oi is for oily.
Ol is for olympic, old boy and old maid.
Om is for ominous.
On is for on and on the whole.
Op is for openly.
Or is for ordinarily and order of magnitude.
Os is for ossification.
Ot is for other.
Ou is for outstanding and outfit.
Ov is for overcome, over and overlap.
Ow is for owner.
Ox is for oxide.
Oy is for oyabun.
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black means black clothing (worn as a sign of mourning); "the widow wore black"; (board games) the darker pieces; the quality or state of the achromatic color of least... more