decapod vs prawn

decapod and prawn both are nouns.

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

As nouns, prawn is a hyponym of decapod; that is, prawn is a word with a more specific, narrower meaning than decapod:

decapod: crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax
prawn: shrimp-like decapod crustacean having two pairs of pincers; most are edible

Other hyponyms of decapod include crab, lobster, crawdad, crawdaddy, crawfish, crayfish, hermit crab, shrimp, tropical prawn.

decapod (noun)	prawn (noun)
crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax	shrimp-like decapod crustacean having two pairs of pincers; most are edible
cephalopods having eight short tentacles plus two long ones	any of various edible decapod crustaceans

decapod (verb)	prawn (verb)
	fish for prawns