genus Cordylus vs reptile genus

genus Cordylus and reptile genus both are nouns.

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

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

genus Cordylus: type genus of the Cordylidae; spiny lizards somewhat resembling tiny crocodiles
reptile genus: a genus of reptiles

genus Cordylus (noun)	reptile genus (noun)
type genus of the Cordylidae; spiny lizards somewhat resembling tiny crocodiles	a genus of reptiles