The best replacement for dispersion is diffusion.

The best alternatives to dispersion are rated as following:
★★★★★  diffusion
★★★★  emulsion
★★★★  dispersal
★★★  dipole
★★★  distribution
★★  diffraction
★★  variability
★★  variance
★★  dipole dipole
★★  diaspora
★  spread
★  variation
★  refraction
★  dipole forces
★  suspension
★  central tendency
★  aspersion
  scattering
  measures of central tendency
  van der waals
  measuring spread
  solid solution

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Speaking about dispersion, one probably shouldn't forget about deviation light.

Other search terms related to dispersion and their ratings are:
★★★★★ deviation light
★★ deviation
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dispersion
diffusion
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