toil vs worthlessness

toil

verb
  • To struggle. 

  • To labour; work. 

  • To weary through excessive labour. 

  • To work (something); often with out. 

noun
  • Trouble, strife. 

  • Labour, work, especially of a grueling nature. 

  • A net or snare; any thread, web, or string spread for taking prey. 

worthlessness

noun
  • The quality of lacking worth, of being valueless, useless or devoid of benefit. 

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