grandfather vs junior

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. 

junior

noun
  • A name suffix used after a son's name when his father has the same name (abbreviations: Jnr., Jr., Jun.). 

  • A younger person. 

  • A junior barrister. 

  • A third-year student at a high school or university. 

adj
  • Belonging to a younger person, or an earlier time of life. 

  • Low in rank; having a subordinate role, job, or situation. 

  • Younger. 

  • Of or pertaining to a third academic year in a four-year high school (eleventh grade) or university. 

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