Denisonia vs reptile genus

Denisonia and reptile genus both are nouns.

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

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

Denisonia: a genus of snakes known as De Vis banded snakes or mud adders (Denisonia)
reptile genus: a genus of reptiles

Denisonia (noun)	reptile genus (noun)
a genus of snakes known as De Vis banded snakes or mud adders (Denisonia)	a genus of reptiles