char vs graffiti

char

verb
  • To burn slightly or superficially so as to affect colour. 

  • To work, especially to do housework; to work by the day, without being a regularly hired servant. 

  • To burn something to charcoal. 

  • To work or hew (stone, etc.) 

noun
  • A charred substance. 

  • A charlady, a woman employed to do housework; cleaning lady. 

  • An odd job, a chore or piece of housework. 

  • A character (text element such as a letter or symbol). 

  • One of the several species of fishes of the genus Salvelinus. 

graffiti

verb
  • To mark a surface with such images. 

noun
  • Drawings or words drawn on a surface in a public place, usually made without authorization. 

  • Informal inscriptions, figure drawings, etc., as opposed to official inscriptions. 

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