auricle vs atrial auricle

auricle and atrial auricle both are nouns.

Word	Noun	Adjective	Verb	Adverb
auricle	Yes	No	No	No
atrial auricle	Yes	No	No	No

As nouns, auricle and atrial auricle are synonyms defined as:

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

Other synonyms of auricle include auricula atrii.

auricle (noun)	atrial 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