auricula atrii vs auricle

auricula atrii and auricle both are nouns.

Word	Noun	Adjective	Verb	Adverb
auricula atrii	Yes	No	No	No
auricle	Yes	No	No	No

As nouns, auricula atrii and auricle are synonyms defined as:

auricula atrii and auricle: a small conical pouch projecting from the upper anterior part of each atrium of the heart

Other synonyms of auricula atrii include atrial auricle.

auricula atrii (noun)	auricle (noun)
a small conical pouch projecting from the upper anterior part of each atrium of the heart	a small conical pouch projecting from the upper anterior part of each atrium of the heart
	the externally visible cartilaginous structure of the external ear