auricular appendix vs auricular appendage

auricular appendix and auricular appendage both are nouns.

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

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

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

Other synonyms of auricular appendix include auricula.

auricular appendix (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