brontosaur vs Apatosaurus excelsus

brontosaur and Apatosaurus excelsus both are nouns.

Word	Noun	Adjective	Verb	Adverb
brontosaur	Yes	No	No	No
Apatosaurus excelsus	Yes	No	No	No

As nouns, brontosaur and Apatosaurus excelsus are synonyms defined as:

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

Other synonyms of brontosaur include apatosaur, apatosaurus, brontosaurus, thunder lizard.

brontosaur (noun)	Apatosaurus excelsus (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