know vs liaison

know

verb
  • To experience. 

  • To perceive the truth or factuality of; to be certain of or that. 

  • To understand or have a grasp of through experience or study. 

  • To be or become aware or cognizant. 

  • To be able to play or perform (a song or other piece of music). 

  • To be acquainted or familiar with; to have encountered. 

  • To be aware of; to be cognizant of. 

  • To recognize as the same (as someone or something previously encountered) after an absence or change. 

  • To have knowledge; to have information, be informed. 

noun
  • Knowledge; the state of knowing. 

  • Knowledge; the state of knowing; now confined to the fixed phrase ‘in the know’ 

liaison

verb
  • To liaise. 

noun
  • The pronunciation of a normally silent final consonant when the next word begins with a vowel. 

  • Communication between two parties or groups. 

  • Co-operation, working together. 

  • A relayer of information between two forces in an army or during war. 

  • Any person who relays information between two groups or organizations. 

  • Fusion of two consecutive words and the manner in which this occurs. 

  • A tryst, romantic meeting. 

  • An illicit sexual relationship or affair. 

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