probing vs scrutiny

probing

noun
  • The action of investigating or exploring. 

adj
  • That investigates or explores deeply; that attempts to elicit information that is concealed. 

scrutiny

noun
  • Thorough inspection of a situation or a case. 

  • Intense study of someone or something. 

  • 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 probing and scrutiny occurred in a corpus of books? (source: Google Ngram Viewer )