Varanus vs reptile genus

Varanus and reptile genus both are nouns.

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

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

Varanus (noun)	reptile genus (noun)
type and sole extant genus of the Varanidae	a genus of reptiles