colour vs colouration

colour

verb
  • Australia, Canada, Ireland, New Zealand, South Africa, and UK standard spelling of color. 

noun
  • Australia, Canada, Ireland, New Zealand, South Africa, and UK standard spelling of color. 

adj
  • Australia, Canada, Ireland, New Zealand, South Africa, and UK standard spelling of color. 

colouration

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