yellow ageratum vs flower

yellow ageratum and flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow ageratum	Yes	No	No	No
flower	Yes	No	Yes	No

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

yellow ageratum: shrub of southwestern Mediterranean region having yellow daisylike flowers
flower: a plant cultivated for its blooms or blossoms

yellow ageratum (noun)	flower (noun)
shrub of southwestern Mediterranean region having yellow daisylike 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

yellow ageratum (verb)	flower (verb)
	produce or yield flowers