afferent vs aural

afferent

adj
  • Carrying towards. 

noun
  • An afferent structure or connection 

aural

adj
  • Of or pertaining to sound. 

  • Of or pertaining to the ear. 

  • Of or pertaining to an aura. 

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