auricula vs auricular appendage

auricula and auricular appendage both are nouns.

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

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

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

Other synonyms of auricula include auricular appendix.

auricula (noun)	auricular appendage (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