bush violet vs flower

bush violet and flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
bush violet	Yes	No	No	No
flower	Yes	No	Yes	No

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

bush violet: any of several herbs of the genus Browallia cultivated for their blue or violet or white flowers
flower: a plant cultivated for its blooms or blossoms

bush violet (noun)	flower (noun)
any of several herbs of the genus Browallia cultivated for their blue or violet or white flowers	a plant cultivated for its blooms or blossoms
	reproductive organ of angiosperm plants especially one having showy or colorful parts
	the period of greatest prosperity or productivity

bush violet (verb)	flower (verb)
	produce or yield flowers