Opheodrys vs reptile genus

Opheodrys and reptile genus both are nouns.

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

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

Opheodrys (noun)	reptile genus (noun)
North American green snakes	a genus of reptiles