drown out vs noise

drown out is not a noun while noise is a noun.

Word	Noun	Adjective	Verb	Adverb
drown out	No	No	Yes	No
noise	Yes	No	Yes	No

As verbs, noise is a hypernym of drown out; that is, noise is a word with a broader meaning than drown out:

Other hypernyms of drown out include make noise, resound.

drown out (noun)	noise (noun)
	the quality of lacking any predictable order or plan
	incomprehensibility resulting from irrelevant information or meaningless facts or remarks
	the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience
	a loud outcry of protest or complaint
	sound of any kind (especially unintelligible or dissonant sound)
	electrical or acoustic activity that can disturb communication

drown out (verb)	noise (verb)
make imperceptible	emit a noise