Menippe mercenaria vs stone crab

Menippe mercenaria and stone crab both are nouns.

Word	Noun	Adjective	Verb	Adverb
Menippe mercenaria	Yes	No	No	No
stone crab	Yes	No	No	No

As nouns, Menippe mercenaria and stone crab are synonyms defined as:

Menippe mercenaria and stone crab: large edible crab of the southern coast of the United States (particularly Florida)

Menippe mercenaria (noun)	stone crab (noun)
large edible crab of the southern coast of the United States (particularly Florida)	large edible crab of the southern coast of the United States (particularly Florida)
	pale flesh with delicate texture and flavor; found in Florida but now very rare