arduous vs picnic

arduous

adj
  • Needing or using up much energy; testing powers of endurance. 

  • Difficult or exhausting to traverse. 

picnic

noun
  • An easy or pleasant task. 

  • An informal social gathering, usually in a natural outdoor setting, to which the participants bring their own food and drink. 

  • The meal eaten at such a gathering. 

  • A cut of pork from the shoulder area (above the front leg) of a pig. 

verb
  • To take part in a picnic. 

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