cliff penstemon vs wild flower

cliff penstemon and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
cliff penstemon	Yes	No	No	No
wild flower	Yes	No	No	No

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

cliff penstemon: one of the West's most beautiful wildflowers; large brilliant pink or rose flowers in many racemes above thick mats of stems and leaves; ledges and cliffs from Washington to California
wild flower: wild or uncultivated flowering plant

Other hypernyms of cliff penstemon include wildflower.

cliff penstemon (noun)	wild flower (noun)
one of the West's most beautiful wildflowers; large brilliant pink or rose flowers in many racemes above thick mats of stems and leaves; ledges and cliffs from Washington to California	wild or uncultivated flowering plant