i vs ri

i

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

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

ri

noun
  • The solfeggio syllable used to indicate the sharp of the second note of a major scale, enharmonic to me. 

  • Synonym of li as a Korean unit of distance equivalent to about 393 m. 

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