flake vs screwball

flake and screwball both are nouns.

Word	Noun	Adjective	Verb	Adverb
flake	Yes	No	Yes	No
screwball	Yes	Yes	No	No

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

Other hyponyms of flake include crackpot, crank, fruitcake, nut, nut case, nutter, wacko, whacko.

flake (noun)	screwball (noun)
a small fragment of something broken off from the whole	a pitch with reverse spin that curves toward the side of the plate from which it was thrown
a person with an unusual or odd personality	a whimsically eccentric person
a crystal of snow

flake (adjective)	screwball (adjective)
	foolish; totally unsound

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