craniate vs gnathostome

craniate and gnathostome both are nouns.

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

As nouns, gnathostome is a hyponym of craniate; that is, gnathostome is a word with a more specific, narrower meaning than craniate:

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

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