Nana vs baba

Nana

name
  • One's grandmother. 

  • A governess. 

  • A Japanese female given name from Japanese 

baba

noun
  • An old woman, especially a traditional old woman from an eastern European culture. 

  • A baby, child. 

  • A grandmother. 

  • A father. 

  • A holy man, a spiritual leader. 

  • A kind of sponge cake soaked in rum-flavoured syrup. 

  • In baby talk, often used for a variety of words beginning with b, such as bottle or blanket. 

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