Iguana iguana vs common iguana

Iguana iguana and common iguana both are nouns.

Word	Noun	Adjective	Verb	Adverb
Iguana iguana	Yes	No	No	No
common iguana	Yes	No	No	No

As nouns, Iguana iguana and common iguana are synonyms defined as:

Iguana iguana and common iguana: large herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America

Other synonyms of Iguana iguana include iguana.

Iguana iguana (noun)	common iguana (noun)
large herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America	large herbivorous tropical American arboreal lizards with a spiny crest along the back; used as human food in Central America and South America