constate vs feign

constate

verb
  • To relay information in a statement and say whether it is true or false. 

  • To ascertain; to verify; to establish; to prove. 

feign

verb
  • To make a false show or pretence of; to counterfeit or simulate. 

  • To hide or conceal. 

  • To make an action as if doing one thing, but actually doing another, for example to trick an opponent; to feint. 

  • To imagine; to invent; to pretend to do something. 

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