brontosaurus vs thunder lizard

brontosaurus and thunder lizard both are nouns.

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

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

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

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

brontosaurus (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