coast boykinia vs wild flower

coast boykinia and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
coast boykinia	Yes	No	No	No
wild flower	Yes	No	No	No

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

coast boykinia: plant with leaves mostly at the base and openly branched clusters of small white flowers; western North America
wild flower: wild or uncultivated flowering plant

Other hypernyms of coast boykinia include wildflower.

coast boykinia (noun)	wild flower (noun)
plant with leaves mostly at the base and openly branched clusters of small white flowers; western North America	wild or uncultivated flowering plant