Mobula hypostoma vs manta ray

Mobula hypostoma and manta ray both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mobula hypostoma	Yes	No	No	No
manta ray	Yes	No	No	No

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

Mobula hypostoma: 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 Mobula hypostoma include devilfish, manta.

Mobula hypostoma (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