Marginocephalia vs animal order

Marginocephalia and animal order both are nouns.

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

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

Marginocephalia: includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs
animal order: the order of animals

Marginocephalia (noun)	animal order (noun)
includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs	the order of animals