auricular appendix vs auricula

auricular appendix and auricula both are nouns.

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

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

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

Other synonyms of auricular appendix include auricular appendage.

auricular appendix (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