thunder lizard vs brontosaur

thunder lizard and brontosaur both are nouns.

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

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

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

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

thunder lizard (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