kitten-tails vs wild flower

kitten-tails and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
kitten-tails	Yes	No	No	No
wild flower	Yes	No	No	No

As nouns, wild flower is a hypernym of kitten-tails; that is, wild flower is a word with a broader meaning than kitten-tails:

Other hypernyms of kitten-tails include wildflower.

kitten-tails (noun)	wild flower (noun)
a plant of the genus Besseya having fluffy spikes of flowers	wild or uncultivated flowering plant