ancon vs obliquity

ancon

noun
  • The elbow. 

  • A console that appears to support a cornice. 

  • The olecranon. 

obliquity

noun
  • Axial tilt. 

  • Mental or moral deviation or perversity; immorality. 

  • The quality of being obscure, oftentimes willfully, sometimes as an exercise in euphemism. 

  • The quality of being oblique in direction, deviating from the horizontal or vertical; or the angle created by such a deviation. 

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