goldenrod vs wildflower

goldenrod and wildflower both are nouns.

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

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

goldenrod: any of numerous chiefly summer-blooming and fall-blooming North American plants especially of the genus Solidago
wildflower: wild or uncultivated flowering plant

Other hypernyms of goldenrod include wild flower.

goldenrod (noun)	wildflower (noun)
any of numerous chiefly summer-blooming and fall-blooming North American plants especially of the genus Solidago	wild or uncultivated flowering plant