godmother vs grandfather

godmother

verb
  • To act as godmother to. 

noun
  • A woman present at the christening of a baby who promises to help raise the child in a Christian manner; a female godparent who sponsors the baptism of a child. 

grandfather

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

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

noun
  • A father of someone's parent. 

  • A male forefather. 

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

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