Pterosauria vs animal order

Pterosauria and animal order both are nouns.

Word	Noun	Adjective	Verb	Adverb
Pterosauria	Yes	No	No	No
animal order	Yes	No	No	No

As nouns, animal order is a hypernym of Pterosauria; that is, animal order is a word with a broader meaning than Pterosauria:

Pterosauria (noun)	animal order (noun)
extinct flying reptiles: pterosaurs	the order of animals