scented penstemon vs wildflower

scented penstemon and wildflower both are nouns.

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

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

scented penstemon: fragrant puffed-up white to reddish-pink flowers in long narrow clusters on erect stems; Arizona to New Mexico and Utah
wildflower: wild or uncultivated flowering plant

Other hypernyms of scented penstemon include wild flower.

scented penstemon (noun)	wildflower (noun)
fragrant puffed-up white to reddish-pink flowers in long narrow clusters on erect stems; Arizona to New Mexico and Utah	wild or uncultivated flowering plant