Urosaurus vs reptile genus

Urosaurus and reptile genus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Urosaurus	Yes	No	No	No
reptile genus	Yes	No	No	No

As nouns, reptile genus is a hypernym of Urosaurus; that is, reptile genus is a word with a broader meaning than Urosaurus:

Urosaurus: a reptile genus of Iguanidae, containing the tree and brush lizards (Urosaurus)
reptile genus: a genus of reptiles

Urosaurus (noun)	reptile genus (noun)
a reptile genus of Iguanidae, containing the tree and brush lizards (Urosaurus)	a genus of reptiles