theropod dinosaur vs theropod

theropod dinosaur and theropod both are nouns.

Word	Noun	Adjective	Verb	Adverb
theropod dinosaur	Yes	No	No	No
theropod	Yes	No	No	No

As nouns, theropod dinosaur and theropod are synonyms defined as:

theropod dinosaur and theropod: any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs

Other synonyms of theropod dinosaur include bird-footed dinosaur.

theropod dinosaur (noun)	theropod (noun)
any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs	any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs