micturition vs piss

micturition and piss both are nouns.

Word	Noun	Adjective	Verb	Adverb
micturition	Yes	No	No	No
piss	Yes	No	Yes	No

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

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

micturition (noun)	piss (noun)
the discharge of urine	informal terms for urination
	liquid excretory product

micturition (verb)	piss (verb)
	eliminate urine