micturition vs voiding

micturition and voiding both are nouns.

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

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

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

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