concretion vs urolith

concretion and urolith both are nouns.

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

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

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

concretion (noun)	urolith (noun)
the union of diverse things into one body or form or group; the growing together of parts	a urinary stone
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)