urolith vs calculus

urolith and calculus both are nouns.

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

As nouns, calculus is a hypernym of urolith; that is, calculus is a word with a broader meaning than urolith:

urolith: a urinary stone
calculus: a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body

Other hypernyms of urolith include concretion.

urolith (noun)	calculus (noun)
a urinary stone	the branch of mathematics that is concerned with limits and with the differentiation and integration of functions
	a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
	an incrustation that forms on the teeth and gums