colour vs colouration

colour

noun

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

verb

  • 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 )