English Opposite / Antonym Words List – O
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- occasionally – frequently
- occupied – vacant
- odd – even
- off – on
- often – seldom
- old – modern
- on – off
- open – closed
- open – closed
- opponent – supporter
- order – mess
- ordinary – special
- other – same
- out – in
- outside – inside
- outskirts – centre
- over – under
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