bottom-feeder vs bottom-dweller

bottom-feeder and bottom-dweller both are nouns.

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

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

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

bottom-feeder (noun)	bottom-dweller (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