mule's ears vs wild flower

mule's ears and wild flower both are nouns.

Word	Noun	Adjective	Verb	Adverb
mule's ears	Yes	No	No	No
wild flower	Yes	No	No	No

As nouns, wild flower is a hypernym of mule's ears; that is, wild flower is a word with a broader meaning than mule's ears:

mule's ears: balsamic-resinous herb with clumps of lanceolate leaves and stout leafy stems ending in large deep yellow flowers on long stalks; northwestern United States
wild flower: wild or uncultivated flowering plant

Other hypernyms of mule's ears include wildflower.

mule's ears (noun)	wild flower (noun)
balsamic-resinous herb with clumps of lanceolate leaves and stout leafy stems ending in large deep yellow flowers on long stalks; northwestern United States	wild or uncultivated flowering plant