bottom-dweller vs bottom-feeder

bottom-dweller and bottom-feeder both are nouns.

Word	Noun	Adjective	Verb	Adverb
bottom-dweller	Yes	No	No	No
bottom-feeder	Yes	No	No	No

As nouns, bottom-dweller and bottom-feeder are synonyms defined as:

bottom-dweller and bottom-feeder: a fish that lives and feeds on the bottom of a body of water

bottom-dweller (noun)	bottom-feeder (noun)
a fish that lives and feeds on the bottom of a body of water	a fish that lives and feeds on the bottom of a body of water
	a scavenger that feeds low on the food chain