African violet vs flower

African violet and flower both are nouns.

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

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

African violet: tropical African plant cultivated as a houseplant for its violet or white or pink flowers
flower: a plant cultivated for its blooms or blossoms

African violet (noun)	flower (noun)
tropical African plant cultivated as a houseplant for its violet or white or pink 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

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