lark vs undertaking

lark

noun
  • Any of various similar-appearing birds, but usually ground-living, such as the meadowlark and titlark. 

  • One who wakes early; one who is up with the larks. 

  • A romp, frolic, some fun. 

  • A prank. 

  • Any of various small, singing passerine birds of the family Alaudidae. 

verb
  • To catch larks (type of bird). 

  • To sport, engage in harmless pranking. 

  • To frolic, engage in carefree adventure. 

undertaking

noun
  • A promise or pledge; a guarantee. 

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

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

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

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