crust vs calculus

crust and calculus both are nouns.

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

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

Other hyponyms of crust include tartar, tophus.

crust (noun)	calculus (noun)
the trait of being rude and impertinent; inclined to take liberties	the branch of mathematics that is concerned with limits and with the differentiation and integration of functions
the outer layer of the Earth	a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
a hard outer layer that covers something	an incrustation that forms on the teeth and gums

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