Ornithopoda vs animal order

Ornithopoda and animal order both are nouns.

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

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

Ornithopoda: widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon)
animal order: the order of animals

Ornithopoda (noun)	animal order (noun)
widespread group including duck-billed dinosaurs and their early relatives (hadrosaurs, trachodon and iguanodon)	the order of animals