Exaeretodon vs reptile genus

Exaeretodon and reptile genus both are nouns.

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

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

Exaeretodon (noun)	reptile genus (noun)
a genus of reptiles of the division Cynodontia	a genus of reptiles