maniac vs nutcase

maniac and nutcase both are nouns.

Word	Noun	Adjective	Verb	Adverb
maniac	Yes	Yes	No	No
nutcase	Yes	No	No	No

As nouns, nutcase is a hyponym of maniac; that is, nutcase is a word with a more specific, narrower meaning than maniac:

Other hyponyms of maniac include crazy, looney, loony, weirdo, bedlamite, pyromaniac, madwoman, madman.

maniac (noun)	nutcase (noun)
an insane person	someone deranged and possibly dangerous
a person who has an obsession with or excessive enthusiasm for something

maniac (adjective)	nutcase (adjective)
wildly disordered