Horned lizard and Iguanid lizard

Horned lizard noun - Insectivorous lizard with hornlike spines on the head and spiny scales on the body; of western North America.

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

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.

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