atrial auricle vs auricula atrii

atrial auricle and auricula atrii both are nouns.

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

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

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

Other synonyms of atrial auricle include auricle.

atrial auricle (noun)	auricula atrii (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