urolith vs concretion

urolith and concretion both are nouns.

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

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

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

Other hypernyms of urolith include calculus.

urolith (noun)	concretion (noun)
a urinary stone	the union of diverse things into one body or form or group; the growing together of parts
	an increase in the density of something
	a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body
	the formation of stonelike objects within a body organ (e.g., the kidneys)