prairie star vs wildflower

prairie star and wildflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
prairie star	Yes	No	No	No
wildflower	Yes	No	No	No

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

prairie star: plant with mostly basal leaves and slender open racemes of white or pale pink flowers; prairies and open forest of northwestern United States to British Columbia and Alberta
wildflower: wild or uncultivated flowering plant

Other hypernyms of prairie star include wild flower.

prairie star (noun)	wildflower (noun)
plant with mostly basal leaves and slender open racemes of white or pale pink flowers; prairies and open forest of northwestern United States to British Columbia and Alberta	wild or uncultivated flowering plant