approval vs permit

approval

noun
  • An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing, or event meets requirements. 

  • Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item. 

  • An expression of favorable acceptance and encouragement; a compliment that also condones. 

permit

noun
  • An artifact or document rendering something allowed or legal. 

  • A pompano of the species Trachinotus falcatus. 

  • A learner's permit. 

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

  • To allow for, to make something possible. 

  • To allow, to admit (of). 

  • 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. 

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