cliff penstemon vs wildflower

cliff penstemon and wildflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
cliff penstemon	Yes	No	No	No
wildflower	Yes	No	No	No

As nouns, wildflower is a hypernym of cliff penstemon; that is, wildflower 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
wildflower: wild or uncultivated flowering plant

Other hypernyms of cliff penstemon include wild flower.

cliff penstemon (noun)	wildflower (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