golden aster vs wild flower

golden aster and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
golden aster	Yes	No	No	No
wild flower	Yes	No	No	No

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

golden aster: any of several shrubby herbs or subshrubs of the genus Chrysopsis having bright golden-yellow flower heads that resemble asters; throughout much of United States and into Canada
wild flower: wild or uncultivated flowering plant

Other hypernyms of golden aster include wildflower.

golden aster (noun)	wild flower (noun)
any of several shrubby herbs or subshrubs of the genus Chrysopsis having bright golden-yellow flower heads that resemble asters; throughout much of United States and into Canada	wild or uncultivated flowering plant