coloring vs cover-up

coloring

noun
  • A disguise or discoloration. 

  • The appearance as to color. 

  • Any substance used to give color. 

  • An assignment of a color to each vertex of a graph such that no two vertices connected by an edge are given the same color. 

  • An act or process which applies color. 

cover-up

noun
  • An attempt to conceal or disguise something, especially a wrongdoing or a mistake. 

  • An item of clothing to be worn over a swimsuit while not in the water. 

How often have the words coloring and cover-up occurred in a corpus of books? (source: Google Ngram Viewer )