ear vs auricle

ear and auricle both are nouns.

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

As nouns, ear and auricle are synonyms defined as:

ear and auricle: the externally visible cartilaginous structure of the external ear

Other synonyms of ear include pinna.

ear (noun)	auricle (noun)
the sense organ for hearing and equilibrium	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	the externally visible cartilaginous structure of the external ear
good hearing
attention to what is said
fruiting spike of a cereal plant especially corn