gay-feather vs wildflower

gay-feather and wildflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
gay-feather	Yes	No	No	No
wildflower	Yes	No	No	No

As nouns, wildflower is a hypernym of gay-feather; that is, wildflower is a word with a broader meaning than gay-feather:

gay-feather: any of various North American plants of the genus Liatris having racemes or panicles of small discoid flower heads
wildflower: wild or uncultivated flowering plant

Other hypernyms of gay-feather include wild flower.

gay-feather (noun)	wildflower (noun)
any of various North American plants of the genus Liatris having racemes or panicles of small discoid flower heads	wild or uncultivated flowering plant