avocation vs undertaking

avocation

noun
  • Pursuits; duties; affairs which occupy one's time; usual employment; vocation. 

  • The calling of a case from an inferior to a superior court. 

  • That which calls one away from one's regular employment or vocation. 

  • A hobby or recreational or leisure pursuit. 

undertaking

noun
  • That which is undertaken; any business, work, or project which a person engages in, or attempts to perform; an enterprise. 

  • A promise or pledge; a guarantee. 

  • The business of an undertaker, or the management of funerals. 

  • The act of one who undertakes (in either sense). 

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