Tiarella vs genus Tiarella

Tiarella and genus Tiarella both are nouns.

Word	Noun	Adjective	Verb	Adverb
Tiarella	Yes	No	No	No
genus Tiarella	Yes	No	No	No

As nouns, Tiarella and genus Tiarella are synonyms defined as:

Tiarella and genus Tiarella: small genus of North American herbs having mostly basal leaves and slender racemes of delicate white flowers

Tiarella (noun)	genus Tiarella (noun)
small genus of North American herbs having mostly basal leaves and slender racemes of delicate white flowers	small genus of North American herbs having mostly basal leaves and slender racemes of delicate white flowers