deepening vs waxing

deepening

noun
  • The act of becoming deeper. 

waxing

noun
  • The action of the verb to wax. 

  • A recording intended for a phonograph. 

  • A cosmetic procedure in which hair is removed from the body by the application and removal of wax. 

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