auricular vs auricle

auricular is not a noun while auricle is a noun.

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

auricular (noun)	auricle (noun)
	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

auricular (adjective)	auricle (adjective)
of or relating to near the ear
pertaining to an auricle of the heart
relating to or perceived by or shaped like the organ of hearing