bladder stone vs calculus

bladder stone and calculus both are nouns.

Word	Noun	Adjective	Verb	Adverb
bladder stone	Yes	No	No	No
calculus	Yes	No	No	No

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

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

Other hypernyms of bladder stone include concretion.

bladder stone (noun)	calculus (noun)
a calculus formed in the bladder	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