marginocephalian vs Marginocephalia

marginocephalian and Marginocephalia both are nouns.

Word	Noun	Adjective	Verb	Adverb
marginocephalian	Yes	No	No	No
Marginocephalia	Yes	No	No	No

As nouns, marginocephalian and Marginocephalia are synonyms defined as:

marginocephalian and Marginocephalia: includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs

Other synonyms of marginocephalian include suborder Marginocephalia.

marginocephalian (noun)	Marginocephalia (noun)
includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs	includes boneheaded (pachycephalosaurs) and horned (ceratopsian) dinosaurs