blue-eyed Mary vs wildflower

blue-eyed Mary and wildflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
blue-eyed Mary	Yes	No	No	No
wildflower	Yes	No	No	No

As nouns, wildflower is a hypernym of blue-eyed Mary; that is, wildflower is a word with a broader meaning than blue-eyed Mary:

blue-eyed Mary: eastern United States plant with whorls of blue-and-white flowers
wildflower: wild or uncultivated flowering plant

Other hypernyms of blue-eyed Mary include wild flower.

blue-eyed Mary (noun)	wildflower (noun)
eastern United States plant with whorls of blue-and-white flowers	wild or uncultivated flowering plant