legwork vs scrutiny

legwork

noun
  • Work, especially research or preparation, that involves significant walking, travel, or similar effort. 

  • Skillful or vigorous use of the legs, as in dance or sports. 

scrutiny

noun
  • Intense study of someone or something. 

  • Thorough inspection of a situation or a case. 

  • A ticket, or little paper billet, on which a vote is written. 

  • An examination by a committee of the votes given at an election, for the purpose of correcting the poll. 

  • An examination of catechumens, in the last week of Lent, who were to receive baptism on Easter Day. 

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