observation vs scrutiny

observation

noun
  • A judgement based on observing. 

  • The act of noting and recording some event; or the record of such noting. 

  • A remark or comment. 

  • A realization of a random variable. 

  • Performance of what is prescribed; adherence in practice; observance. 

  • A regime under which a subject is routinely observed. 

  • Philosophically as: the phenomenal presence of human being existence. 

  • The act of observing, and the fact of being observed (see observance) 

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