i vs l

i

character

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

noun

  • The name of the Latin-script letter I/i. 

l

character

  • The twelfth letter of the English alphabet, called el and written in the Latin script. 

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