lunatic vs nutcase

lunatic and nutcase both are nouns.

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

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

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

lunatic (noun)	nutcase (noun)
an insane person	someone deranged and possibly dangerous
a reckless impetuous irresponsible person

lunatic (adjective)	nutcase (adjective)
insane and believed to be affected by the phases of the moon