suborder Marginocephalia vs marginocephalian

suborder Marginocephalia and marginocephalian both are nouns.

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

As nouns, suborder Marginocephalia and marginocephalian are synonyms defined as:

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

Other synonyms of suborder Marginocephalia include Marginocephalia.

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