Iguana and Iguanid

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

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

Iguana and iguanid are semantically related. Sometimes you can replace term "Iguana" with "Iguanid", this nouns are similar.