crust vs rudeness

crust and rudeness both are nouns.

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

As nouns, rudeness is a hypernym of crust; that is, rudeness is a word with a broader meaning than crust:

Other hypernyms of crust include discourtesy.

crust (noun)	rudeness (noun)
the trait of being rude and impertinent; inclined to take liberties	a manner that is rude and insulting
the outer layer of the Earth	a wild or unrefined state
a hard outer layer that covers something

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