airbrush vs graffiti

airbrush

verb
  • To paint using an airbrush. 

  • To touch up or enhance a photograph or person, often with intent to mislead. 

noun
  • A miniature, handheld paint sprayer, powered by compressed air or other gas, used for delicate, artistic painting, or sometimes retouching of photographs. 

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 airbrush and graffiti occurred in a corpus of books? (source: Google Ngram Viewer )