crustaceous vs crust

crustaceous is not a noun while crust is a noun.

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

crustaceous (noun)	crust (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

crustaceous (adjective)	crust (adjective)
being or having or resembling a hard crust or shell
of or belonging to the class Crustacea

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