brontosaur vs apatosaurus

brontosaur and apatosaurus both are nouns.

Word	Noun	Adjective	Verb	Adverb
brontosaur	Yes	No	No	No
apatosaurus	Yes	No	No	No

As nouns, brontosaur and apatosaurus are synonyms defined as:

brontosaur and apatosaurus: huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic

Other synonyms of brontosaur include apatosaur, Apatosaurus excelsus, brontosaurus, thunder lizard.

brontosaur (noun)	apatosaurus (noun)
huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic	huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic