mule's ears vs wildflower

mule's ears and wildflower both are nouns.

Word	Noun	Adjective	Verb	Adverb
mule's ears	Yes	No	No	No
wildflower	Yes	No	No	No

As nouns, wildflower is a hypernym of mule's ears; that is, wildflower 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
wildflower: wild or uncultivated flowering plant

Other hypernyms of mule's ears include wild flower.

mule's ears (noun)	wildflower (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