Saxifraga occidentalis vs genus Saxifraga

Saxifraga occidentalis and genus Saxifraga both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saxifraga occidentalis	Yes	No	No	No
genus Saxifraga	Yes	No	No	No

Saxifraga occidentalis (noun)	genus Saxifraga (noun)
saxifrage having loose clusters of white flowers on hairy stems growing from a cluster of basal leaves; moist slopes of western North America	type genus of the Saxifragaceae; large genus of usually perennial herbs of Arctic and cool regions of Northern Hemisphere: saxifrage