I vs n

I

character
  • The ninth letter of the English alphabet, called i and written in the Latin script. 

noun
  • Interstate. 

  • The ego. 

pron
  • The speaker or writer, referred to as the grammatical subject, of a sentence. 

  • The speaker or writer, referred to as the grammatical object, of a sentence. 

n

character
  • The fourteenth letter of the English alphabet, called en and written in the Latin script. 

noun
  • noun 

  • Neutral 

  • Shortening of and, used in set phrases like rock-n-roll. 

  • normal 

  • No 

  • neuter gender 

  • north 

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