nut case vs flake

nut case and flake both are nouns.

Word	Noun	Adjective	Verb	Adverb
nut case	Yes	No	No	No
flake	Yes	No	Yes	No

As nouns, flake is a hypernym of nut case; that is, flake is a word with a broader meaning than nut case:

Other hypernyms of nut case include eccentric, eccentric person, geek, oddball.

nut case (noun)	flake (noun)
a whimsically eccentric person	a small fragment of something broken off from the whole
	a person with an unusual or odd personality
	a crystal of snow

nut case (verb)	flake (verb)
	come off in flakes or thin small pieces
	cover with flakes or as if with flakes
	form into flakes