crust vs crusty

crust is a noun but crusty is not a noun.

Word	Noun	Adjective	Verb	Adverb
crust	Yes	No	Yes	No
crusty	No	Yes	No	No

crust (noun)	crusty (noun)
the trait of being rude and impertinent; inclined to take liberties
the outer layer of the Earth
a hard outer layer that covers something

crust (adjective)	crusty (adjective)
	having a hardened crust as a covering
	brusque and surly and forbidding

crust (verb)	crusty (verb)
form a crust or form into a crust