Iguanid and Lizard

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

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

Lizard noun - Relatively long-bodied reptile with usually two pairs of legs and a tapering tail.

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