auricle vs thalamus

auricle

noun
  • Synonym of atrium. 

  • The outer ear or pinna. 

  • An anterior ear-shaped appendage of the left or right atrium of the human heart. 

  • Any appendage in the shape of an ear or earlobe. 

thalamus

noun
  • An inner room or nuptial chamber. 

  • The receptacle of a flower; a torus. 

  • A thallus. 

  • Either of two large, ovoid structures of grey matter within the forebrain that relay sensory impulses to the cerebral cortex. 

How often have the words auricle and thalamus occurred in a corpus of books? (source: Google Ngram Viewer )