bitterroot vs wild flower

bitterroot and wild flower both are nouns.

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

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

bitterroot: showy succulent ground-hugging plant of Rocky Mountains regions having deep to pale pink flowers and fleshy farinaceous roots; the Montana state flower
wild flower: wild or uncultivated flowering plant

Other hypernyms of bitterroot include wildflower.

bitterroot (noun)	wild flower (noun)
showy succulent ground-hugging plant of Rocky Mountains regions having deep to pale pink flowers and fleshy farinaceous roots; the Montana state flower	wild or uncultivated flowering plant