Apatosaurus excelsus vs brontosaur

Apatosaurus excelsus and brontosaur both are nouns.

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

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

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

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

Apatosaurus excelsus (noun)	brontosaur (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