| ammoniac | (noun) the aromatic gum of the ammoniac plant | Synonyms: gum ammoniac |
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| brainiac | (noun) someone who has exceptional intellectual ability and originality | Synonyms: brain, Einstein, genius, mastermind |
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| demoniac | (noun) someone who acts as if possessed by a demon | - |
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| dipsomaniac | (noun) a person who drinks alcohol to excess habitually | Synonyms: alcoholic, alky, boozer, lush, soaker, souse |
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| egomaniac | (noun) an abnormally egotistical person | - |
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| insomniac | (noun) someone who cannot sleep | Synonyms: sleepless person |
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| kleptomaniac | (noun) someone with an irrational urge to steal in the absence of an economic motive | - |
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| maniac | (noun) an insane person | Synonyms: lunatic |
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| (noun) a person who has an obsession with or excessive enthusiasm for something | - |
| megalomaniac | (noun) a pathological egotist | - |
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| monomaniac | (noun) a person suffering from monomania | - |
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| nymphomaniac | (noun) a woman with abnormal sexual desires | Synonyms: nympho |
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| pyromaniac | (noun) a person with a mania for setting things on fire | - |
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