micturition vs excreting

micturition and excreting both are nouns.

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

As nouns, excreting is a hypernym of micturition; that is, excreting is a word with a broader meaning than micturition:

Other hypernyms of micturition include elimination, evacuation, excretion, voiding.

micturition (noun)	excreting (noun)
the discharge of urine	the bodily process of discharging waste matter