thunder lizard vs Apatosaurus excelsus

thunder lizard and Apatosaurus excelsus both are nouns.

Word	Noun	Adjective	Verb	Adverb
thunder lizard	Yes	No	No	No
Apatosaurus excelsus	Yes	No	No	No

As nouns, thunder lizard and Apatosaurus excelsus are synonyms defined as:

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

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

thunder lizard (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