mouthbreeder vs fish

mouthbreeder and fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
mouthbreeder	Yes	No	No	No
fish	Yes	No	Yes	No

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

mouthbreeder: any of various fishes that carry their eggs and their young in their mouths
fish: any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills

mouthbreeder (noun)	fish (noun)
any of various fishes that carry their eggs and their young in their mouths	any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
	the flesh of fish used as food

mouthbreeder (verb)	fish (verb)
	catch or try to catch fish or shellfish
	seek indirectly