Amniota vs craniate

Amniota and craniate both are nouns.

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

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

Amniota: higher vertebrates (reptiles, birds and mammals) possessing an amnion during development
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 Amniota include vertebrate.

Amniota (noun)	craniate (noun)
higher vertebrates (reptiles, birds and mammals) possessing an amnion during development	animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium