carnosaur vs theropod dinosaur

carnosaur and theropod dinosaur both are nouns.

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

As nouns, theropod dinosaur is a hypernym of carnosaur; that is, theropod dinosaur is a word with a broader meaning than carnosaur:

carnosaur: large carnivorous bipedal dinosaur having huge claws
theropod dinosaur: any of numerous carnivorous dinosaurs of the Triassic to Cretaceous with short forelimbs that walked or ran on strong hind legs

Other hypernyms of carnosaur include bird-footed dinosaur, theropod.

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