gramma vs nana

gramma

noun
  • Something that is written. 

  • The subjects of reading, writing, and arithmetic. 

  • A variety of pumpkin, a cultivar of Cucurbita moschata. 

nana

noun
  • A nanny. 

  • A banana. 

  • One's grandmother. 

  • A foolish person. 

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