denote vs imply

denote

verb
  • To indicate; to mark. 

  • To make overt. 

  • To refer to literally; to convey as meaning. 

imply

verb
  • to hint; to insinuate; to suggest tacitly and avoid a direct statement 

  • to suggest by logical inference 

  • to have as a necessary consequence 

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