goldenrod vs wild flower

goldenrod and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
goldenrod	Yes	No	No	No
wild flower	Yes	No	No	No

As nouns, wild flower is a hypernym of goldenrod; that is, wild flower 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
wild flower: wild or uncultivated flowering plant

Other hypernyms of goldenrod include wildflower.

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