prawn vs seafood

prawn and seafood both are nouns.

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

As nouns, seafood is a hypernym of prawn; that is, seafood is a word with a broader meaning than prawn:

prawn: any of various edible decapod crustaceans
seafood: edible fish (broadly including freshwater fish) or shellfish or roe etc

prawn (noun)	seafood (noun)
shrimp-like decapod crustacean having two pairs of pincers; most are edible	edible fish (broadly including freshwater fish) or shellfish or roe etc
any of various edible decapod crustaceans

prawn (verb)	seafood (verb)
fish for prawns