alibi vs subterfuge

alibi

noun
  • The plea or mode of defense under which a person on trial for a crime proves or attempts to prove being in another place when the alleged act was committed. 

  • An excuse, especially one used to avoid responsibility or blame. 

verb
  • To provide an alibi for. 

  • To provide an excuse for. 

subterfuge

noun
  • Deception; misrepresentation of the true nature of an activity. 

  • An indirect or deceptive device or stratagem; a blind. Refers especially to war and diplomatics. 

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