iguana vs Iguana iguana

iguana and Iguana iguana both are nouns.

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

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

iguana and Iguana 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 include common iguana.

iguana (noun)	Iguana 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