c vs o

c

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

noun
  • The middle tone in either one of the sets of seven white keys on a keyboard or a set of seven strings on a stringed instrument. 

o

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

adj
  • Over 

noun
  • A zero (used in reading out numbers). 

  • Operator 

  • The name of the Latin-script letter O/o. 

  • Object, see SVO 

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