bottom lurkers vs fish

bottom lurkers and fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
bottom lurkers	Yes	No	No	No
fish	Yes	No	Yes	No

As nouns, fish is a hypernym of bottom lurkers; that is, fish is a word with a broader meaning than bottom lurkers:

bottom lurkers: a fish that lurks on the bottom of a body of water
fish: any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

bottom lurkers (noun)	fish (noun)
a fish that lurks on the bottom of a body of water	any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
	the flesh of fish used as food

bottom lurkers (verb)	fish (verb)
	catch or try to catch fish or shellfish
	seek indirectly