The best replacement for grayscale is black and white.

The best alternatives to grayscale are rated as following:
★★★★★  black and white
★★★  monochrome
★★  grayscale
★★  black and white scanning
★★  black ink only
★  rgb
★  greyscale
★  pure black and white
★  bitmap
★  desaturate
  color fishfinder
  black ink
  bitonal
  16 bit grayscale
  halftone
  black & white
  gray scale

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Google Trends

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grayscale
black and white
monochrome