blue-belly vs fence lizard

blue-belly and fence lizard both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue-belly	Yes	No	No	No
fence lizard	Yes	No	No	No

As nouns, fence lizard is a hypernym of blue-belly; that is, fence lizard is a word with a broader meaning than blue-belly:

blue-belly: common western lizard; seen on logs or rocks
fence lizard: spiny lizard often seen basking on fences in the United States and northern Mexico

blue-belly (noun)	fence lizard (noun)
common western lizard; seen on logs or rocks	spiny lizard often seen basking on fences in the United States and northern Mexico