still-fish vs fish

still-fish is not a noun while fish is a noun.

Word	Noun	Adjective	Verb	Adverb
still-fish	No	No	Yes	No
fish	Yes	No	Yes	No

As verbs, fish is a hypernym of still-fish; that is, fish is a word with a broader meaning than still-fish:

still-fish: fish with the line and bait resting still or stationary in the water
fish: catch or try to catch fish or shellfish

still-fish (noun)	fish (noun)
	any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
	the flesh of fish used as food

still-fish (verb)	fish (verb)
fish with the line and bait resting still or stationary in the water	catch or try to catch fish or shellfish
	seek indirectly