gnathostome vs craniate

gnathostome and craniate both are nouns.

Word	Noun	Adjective	Verb	Adverb
gnathostome	Yes	No	No	No
craniate	Yes	No	No	No

As nouns, craniate is a hypernym of gnathostome; that is, craniate is a word with a broader meaning than gnathostome:

gnathostome: a vertebrate animal possessing true jaws
craniate: animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium

Other hypernyms of gnathostome include vertebrate.

gnathostome (noun)	craniate (noun)
a vertebrate animal possessing true jaws	animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium