The best replacement for colour is color.

The best alternatives to colour are rated as following:
★★★★★  color
★★★  black and white
★★  color spelling
★  clarity
★  flower
★  monochrome
★  color which is correct
★  color uk
★  shade
★  colour
★  color canada
  color in canada
  shave
  black and white photography
  semi permanent
  true colour
  shape
  skin colour
  special effects
  manic panic
  wall colour
  color australia
  water colour
  henna

Your alternative for colour is not listed? Suggest!
Speaking about colour, one probably shouldn't forget about ammonia.

Other search terms related to colour and their ratings are:
★★★★★ ammonia
barbie
personality
You have in mind a companion for colour and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of colour in all years. Click on graph for more.
colour
color
black and white