speedwell vs flower

speedwell and flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
speedwell	Yes	No	No	No
flower	Yes	No	Yes	No

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

speedwell (noun)	flower (noun)
any plant of the genus Veronica	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

speedwell (verb)	flower (verb)
	produce or yield flowers