decapod vs shrimp

decapod and shrimp both are nouns.

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

As nouns, shrimp is a hyponym of decapod; that is, shrimp 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
shrimp: small slender-bodied chiefly marine decapod crustaceans with a long tail and single pair of pincers; many species are edible

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

decapod (noun)	shrimp (noun)
crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax	small slender-bodied chiefly marine decapod crustaceans with a long tail and single pair of pincers; many species are edible
cephalopods having eight short tentacles plus two long ones	any of various edible decapod crustaceans
	disparaging terms for small people

decapod (verb)	shrimp (verb)
	fish for shrimp