auricular appendage vs auricula

auricular appendage and auricula both are nouns.

Word	Noun	Adjective	Verb	Adverb
auricular appendage	Yes	No	No	No
auricula	Yes	No	No	No

As nouns, auricular appendage and auricula are synonyms defined as:

auricular appendage and auricula: a pouch projecting from the top front of each atrium of the heart

Other synonyms of auricular appendage include auricular appendix.

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