crust vs crustal plate

crust and crustal plate both are nouns.

Word	Noun	Adjective	Verb	Adverb
crust	Yes	No	Yes	No
crustal plate	Yes	No	No	No

As nouns, crustal plate is a hyponym of crust; that is, crustal plate is a word with a more specific, narrower meaning than crust:

crust: the outer layer of the Earth
crustal plate: a rigid layer of the Earth's crust that is believed to drift slowly

Other hyponyms of crust include horst, plate.

crust (noun)	crustal plate (noun)
the trait of being rude and impertinent; inclined to take liberties	a rigid layer of the Earth's crust that is believed to drift slowly
the outer layer of the Earth
a hard outer layer that covers something

crust (verb)	crustal plate (verb)
form a crust or form into a crust