Sauropterygia vs animal order

Sauropterygia and animal order both are nouns.

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

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

Sauropterygia (noun)	animal order (noun)
extinct marine reptiles: plesiosaurs; nothosaurs	the order of animals