river prawn vs long-clawed prawn

river prawn and long-clawed prawn both are nouns.

Word	Noun	Adjective	Verb	Adverb
river prawn	Yes	No	No	No
long-clawed prawn	Yes	No	No	No

As nouns, river prawn and long-clawed prawn are synonyms defined as:

river prawn and long-clawed prawn: large (a foot or more) edible freshwater prawn common in Australian rivers

Other synonyms of river prawn include Palaemon australis.

river prawn (noun)	long-clawed prawn (noun)
large (a foot or more) edible freshwater prawn common in Australian rivers	large (a foot or more) edible freshwater prawn common in Australian rivers
large Australian prawn