colourable vs tricolour

colourable

adj
  • That can be coloured. 

  • Apparently true; specious; potentially justifiable. 

tricolour

adj
  • Having three colours. 

noun
  • A flag consisting of three stripes that are either vertical or horizontal; all of equal size, and of a different colour each. 

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