notice vs spy

notice

verb
  • To become aware of; to observe. 

  • To be noticeable; to show. 

noun
  • 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. 

  • The act of observing; perception. 

  • A formal notification or warning. 

  • Prior notification. 

spy

verb
  • To explore; to see; to view; inspect and examine secretly, as a country. 

  • To act as a spy. 

  • To search narrowly; to scrutinize. 

  • To spot; to catch sight of. 

noun
  • A defensive player assigned to cover an offensive backfield player man-to-man when they are expected to engage in a running play, but the offensive player does not run with the ball immediately. 

  • A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage). 

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