giant lizard vs dragon lizard

giant lizard and dragon lizard both are nouns.

Word	Noun	Adjective	Verb	Adverb
giant lizard	Yes	No	No	No
dragon lizard	Yes	No	No	No

As nouns, giant lizard and dragon lizard are synonyms defined as:

giant lizard and dragon lizard: the largest lizard in the world (10 feet); found on Indonesian islands

Other synonyms of giant lizard include Komodo dragon, Komodo lizard, Varanus komodoensis.

giant lizard (noun)	dragon lizard (noun)
the largest lizard in the world (10 feet); found on Indonesian islands	the largest lizard in the world (10 feet); found on Indonesian islands