bedwetter vs urinator

bedwetter and urinator both are nouns.

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

As nouns, urinator is a hypernym of bedwetter; that is, urinator is a word with a broader meaning than bedwetter:

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

Other hypernyms of bedwetter include pisser.

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