brontosaur vs thunder lizard

brontosaur and thunder lizard both are nouns.

Word	Noun	Adjective	Verb	Adverb
brontosaur	Yes	No	No	No
thunder lizard	Yes	No	No	No

As nouns, brontosaur and thunder lizard are synonyms defined as:

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

Other synonyms of brontosaur include apatosaur, apatosaurus, Apatosaurus excelsus, brontosaurus.

brontosaur (noun)	thunder lizard (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