Iguana iguana and Iguanid lizard

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.

Iguanid lizard and Iguana iguana are semantically related. In some cases you can use "Iguanid lizard" instead a noun phrase "Iguana iguana".

Iguanid lizard noun - Lizards of the New World and Madagascar and some Pacific islands; typically having a long tail and bright throat patch in males.

Iguana iguana and iguanid lizard are semantically related. Sometimes you can replace phrase "Iguana iguana" with "Iguanid lizard", this phrases are similar.