devil ray vs manta ray

devil ray and manta ray both are nouns.

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

As nouns, manta ray is a hypernym of devil ray; that is, manta ray is a word with a broader meaning than devil ray:

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

Other hypernyms of devil ray include devilfish, manta.

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