notice vs observation

notice

noun
  • The act of observing; perception. 

  • A published critical review of a play or the like. 

  • A written or printed announcement. 

  • Advance notification of termination of employment, given by an employer to an employee or vice versa. 

  • A formal notification or warning. 

  • Prior notification. 

verb
  • To be noticeable; to show. 

  • To become aware of; to observe. 

observation

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

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

  • A remark or comment. 

  • A realization of a random variable. 

  • A judgement based on observing. 

  • 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. 

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