yellow salsify vs wildflower

yellow salsify and wildflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
yellow salsify	Yes	No	No	No
wildflower	Yes	No	No	No

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

yellow salsify: European perennial naturalized throughout United States having hollow stems with a few long narrow tapered leaves and each bearing a solitary pale yellow flower
wildflower: wild or uncultivated flowering plant

Other hypernyms of yellow salsify include wild flower.

yellow salsify (noun)	wildflower (noun)
European perennial naturalized throughout United States having hollow stems with a few long narrow tapered leaves and each bearing a solitary pale yellow flower	wild or uncultivated flowering plant