gayfeather vs wildflower

gayfeather and wildflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
gayfeather	Yes	No	No	No
wildflower	Yes	No	No	No

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

gayfeather: 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 gayfeather include wild flower.

gayfeather (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