prawn vs fish

prawn and fish both are nouns.

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

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

prawn (noun)	fish (noun)
shrimp-like decapod crustacean having two pairs of pincers; most are edible	any of various mostly cold-blooded aquatic vertebrates usually having scales and breathing through gills
any of various edible decapod crustaceans	the flesh of fish used as food

prawn (verb)	fish (verb)
fish for prawns	catch or try to catch fish or shellfish
	seek indirectly