The difference between Lunatic and Maniacal
When used as adjectives, lunatic means crazed, mad, insane, demented, whereas maniacal means like a maniac.
Lunatic is also noun with the meaning: an insane person.
check bellow for the other definitions of Lunatic and Maniacal
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Lunatic as a noun:
An insane person.
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Lunatic as an adjective:
Crazed, mad, insane, demented.
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Maniacal as an adjective:
Like a maniac; insane; frenzied.