1. operative - Active.
2. operator - One who works with or controls some machine or scientific apparatus.
3. operetta - A humorous play in dialogue and music, of more than one act.
4. opinion - A conclusion or judgment held with confidence, but falling short of positive knowledge.
5. opponent - One who supports the opposite side in a debate, discussion, struggle, or sport.
6. opportune - Especially fit as occurring, said, or done at the right moment.
7. opportunist - One who takes advantage of circumstances to gain his ends.
8. opportunity - Favorable or advantageous chance or opening.
9. opposite - Radically different or contrary in action or movement.
10. opprobrium - The state of being scornfully reproached or accused of evil.
11. optic - Pertaining to the eye or vision.
12. optician - One who makes or deals in optical instruments or eye-glasses.
13. optics - The science that treats of light and vision, and all that is connected with sight.
14. optimism - The view that everything in nature and the history of mankind is ordered for the best.
15. option - The right, power, or liberty of choosing.
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