urination vs lithuresis

urination and lithuresis both are nouns.

Word	Noun	Adjective	Verb	Adverb
urination	Yes	No	No	No
lithuresis	Yes	No	No	No

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

Other hyponyms of urination include leak, making water, passing water, wetting, nocturia, nycturia, oliguria, pee, peeing, piss, pissing.

urination (noun)	lithuresis (noun)
the discharge of urine	passing small stones with the urine