sand verbena vs wild flower

sand verbena and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
sand verbena	Yes	No	No	No
wild flower	Yes	No	No	No

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

sand verbena: any of various plants of the genus Abronia of western North America and Mexico having flowers resembling verbena
wild flower: wild or uncultivated flowering plant

Other hypernyms of sand verbena include wildflower.

sand verbena (noun)	wild flower (noun)
any of various plants of the genus Abronia of western North America and Mexico having flowers resembling verbena	wild or uncultivated flowering plant