character vs letter

character

noun
  • A written or printed symbol, or letter. 

  • Strength of mind; resolution; independence; individuality; moral strength. 

  • A complex number representing an element of a finite Abelian group. 

  • A being involved in the action of a story. 

  • A person or individual, especially one who is unknown. 

  • Quality, position, rank, or capacity; quality or conduct with respect to a certain office or duty. 

  • One of the basic elements making up a text file or string: a code representing a printing character or a control character. 

  • A distinguishing feature; characteristic; trait; phene. 

  • A complex of traits marking a person, group, breed, or type. 

  • A unique or extraordinary individual; a person characterized by peculiar or notable traits, especially charisma. 

letter

noun
  • A symbol in an alphabet. 

  • A size of paper, 215 mm × 280 mm. 

  • Literature. 

  • A size of paper, 8½ in × 11 in (215.9 mm × 279.4 mm, US paper sizes rounded to the nearest 5 mm). 

  • A division unit of a piece of law marked by a letter of the alphabet. 

  • One who lets, or lets out. 

  • The literal meaning of something, as distinguished from its intended and remoter meaning (the spirit). 

  • A written or printed communication, generally longer and more formal than a note. 

verb
  • To print, inscribe, or paint letters on something. 

  • To earn a varsity letter (award). 

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