urinator vs bedwetter

urinator and bedwetter both are nouns.

Word	Noun	Adjective	Verb	Adverb
urinator	Yes	No	No	No
bedwetter	Yes	No	No	No

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

urinator: a person who urinates
bedwetter: someone suffering from enuresis; someone who urinates while asleep in bed

Other hyponyms of urinator include bed wetter, wetter.

urinator (noun)	bedwetter (noun)
a person who urinates	someone suffering from enuresis; someone who urinates while asleep in bed