auricle vs cardioventricle

auricle

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

  • Synonym of atrium. 

  • The outer ear or pinna. 

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

cardioventricle

noun
  • A ventricle of the heart 

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