Viola striata vs violet

Viola striata and violet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Viola striata	Yes	No	No	No
violet	Yes	Yes	No	No

As nouns, violet is a hypernym of Viola striata; that is, violet is a word with a broader meaning than Viola striata:

Viola striata: leafy-stemmed violet of eastern North America having large white or creamy flowers faintly marked with purple
violet: any of numerous low-growing violas with small flowers

Viola striata (noun)	violet (noun)
leafy-stemmed violet of eastern North America having large white or creamy flowers faintly marked with purple	a variable color that lies beyond blue in the spectrum
	any of numerous low-growing violas with small flowers

Viola striata (adjective)	violet (adjective)
	of a color intermediate between red and blue