shrimp vs river prawn

shrimp and river prawn both are nouns.

Word	Noun	Adjective	Verb	Adverb
shrimp	Yes	No	Yes	No
river prawn	Yes	No	No	No

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

shrimp (noun)	river prawn (noun)
small slender-bodied chiefly marine decapod crustaceans with a long tail and single pair of pincers; many species are edible	large (a foot or more) edible freshwater prawn common in Australian rivers
any of various edible decapod crustaceans	large Australian prawn
disparaging terms for small people

shrimp (verb)	river prawn (verb)
fish for shrimp