ONE WORD SUBSTITUTION.

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1. One who is out to subvert a government - Anarchist.
2. One who is recovering from illness - Convalescent.
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3. One who is all powerful - Omnipotent 
4. One who is present everywhere - Omnipresent.
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5. One who knows everything - Omniscient.
6. One who is easily deceived - Gullible.
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7. One who does not make mistakes - Infallible.
8. One who can do anything for money - Mercenary.
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9. One who has no money - Pauper.
10. One who changes sides - Turncoat.
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11. One who works for free - Volunteer
12. One who loves books - Bibliophile.
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13. One who can speak two languages -Bilingual.
14. One who loves mankind - Philanthropist.
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15. One who hates mankind - Misanthrope.
16. One who looks on the bright side of things - Optimist
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17. One who looks on the dark side of things - Pessimist
18. One who doubts the existence of god - Agnostic .
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19. One who pretends to be what he is not - Hypocrite.
20. One incapable of being tired - Indefatigable.