apatosaurus vs Apatosaurus excelsus

apatosaurus and Apatosaurus excelsus both are nouns.

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

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

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

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

apatosaurus (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