urination vs wetting

urination and wetting both are nouns.

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

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

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

urination (noun)	wetting (noun)
the discharge of urine	the act of making something wet
	a euphemism for urination