manta ray vs devil ray

manta ray and devil ray both are nouns.

Word	Noun	Adjective	Verb	Adverb
manta ray	Yes	No	No	No
devil ray	Yes	No	No	No

As nouns, devil ray is a hyponym of manta ray; that is, devil ray is a word with a more specific, narrower meaning than manta ray:

manta ray: extremely large pelagic tropical ray that feeds on plankton and small fishes; usually harmless but its size make it dangerous if harpooned
devil ray: small manta (to 4 feet) that travels in schools

Other hyponyms of manta ray include Atlantic manta, Manta birostris, Mobula hypostoma.

manta ray (noun)	devil ray (noun)
extremely large pelagic tropical ray that feeds on plankton and small fishes; usually harmless but its size make it dangerous if harpooned	small manta (to 4 feet) that travels in schools