auricula atrii vs atrial auricle

auricula atrii and atrial auricle both are nouns.

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

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

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

Other synonyms of auricula atrii include auricle.

auricula atrii (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