bear's ear vs auricula

bear's ear and auricula both are nouns.

Word	Noun	Adjective	Verb	Adverb
bear's ear	Yes	No	No	No
auricula	Yes	No	No	No

As nouns, bear's ear and auricula are synonyms defined as:

bear's ear and auricula: yellow-flowered primrose native to Alps; commonly cultivated

Other synonyms of bear's ear include Primula auricula.

bear's ear (noun)	auricula (noun)
yellow-flowered primrose native to Alps; commonly cultivated	a pouch projecting from the top front of each atrium of the heart
	yellow-flowered primrose native to Alps; commonly cultivated