apatosaur vs brontosaurus

apatosaur and brontosaurus both are nouns.

Word	Noun	Adjective	Verb	Adverb
apatosaur	Yes	No	No	No
brontosaurus	Yes	No	No	No

As nouns, apatosaur and brontosaurus are synonyms defined as:

apatosaur and brontosaurus: huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic

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

apatosaur (noun)	brontosaurus (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