let vs sanction

let

verb
  • To give, grant, or assign, as a work, privilege, or contract; often with out. 

  • Used to introduce a first or third person imperative verb construction. 

  • To cause (+ bare infinitive). 

  • To allow the release of (a fluid). 

  • To allow possession of (a property etc.) in exchange for rent. 

  • To allow to be or do without interference; to not disturb or meddle with; to leave (someone or something) alone. 

  • To allow to, not to prevent (+ infinitive, but usually without to). 

noun
  • The hindrance caused by the net during serve, only if the ball falls legally. 

  • An obstacle or hindrance. 

  • The allowing of possession of a property etc. in exchange for rent. 

sanction

verb
  • To give official authorization or approval to; to countenance. 

  • To penalize (a state etc.) with sanctions. 

  • To ratify; to make valid. 

noun
  • An approval, by an authority, generally one that makes something valid. 

  • A penalty, punishment, or some coercive measure, intended to ensure compliance; especially one adopted by several nations, or by an international body. 

  • A law, treaty, or contract, or a clause within a law, treaty, or contract, specifying any of the above. 

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