ceratopsian vs horned dinosaur

ceratopsian and horned dinosaur both are nouns.

Word	Noun	Adjective	Verb	Adverb
ceratopsian	Yes	No	No	No
horned dinosaur	Yes	No	No	No

As nouns, ceratopsian and horned dinosaur are synonyms defined as:

ceratopsian and horned dinosaur: any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia

ceratopsian (noun)	horned dinosaur (noun)
any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia	any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia