permit vs thwart

permit

verb
  • To allow, to admit (of). 

  • To allow (something) to happen, to give permission for. 

  • To allow for, to make something possible. 

  • To grant formal authorization for (something). 

  • To attempt to obtain or succeed in obtaining formal authorization for (something). 

  • To allow (someone) to do something; to give permission to. 

noun
  • A pompano of the species Trachinotus falcatus. 

  • An artifact or document rendering something allowed or legal. 

  • A learner's permit. 

thwart

verb
  • To cause to fail; to frustrate, to prevent. 

noun
  • A seat across a boat on which a rower may sit. 

  • An act of thwarting; something which thwarts; a hindrance, an obstacle. 

  • A brace, perpendicular to the keel, that helps maintain the beam (“breadth”) of a marine vessel against external water pressure and that may serve to support the rail. 

adj
  • Placed or situated across something else; cross, oblique, transverse. 

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