grandfather vs pensioner

grandfather

noun
  • A father of someone's parent. 

  • A male forefather. 

  • The archived older version of a file that immediately preceded the father file. 

verb
  • To retain discontinued laws or rules for (a thing, person or organization previously affected by them). 

  • To be, or act as, a grandfather to. 

pensioner

noun
  • Someone who is at the age at which one typically receives a pension; an elderly person. 

  • Someone who lives on a pension, especially the retirement or old age pension. 

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