The best replacement for diffusion is osmosis.

The best alternatives to diffusion are rated as following:
★★★★★  osmosis
★★★  active transport
★★★  effusion
★★  facilitated diffusion
★★  perfusion
★  independent invention
★  convection
★  dispersion
★  absorption
★  passive transport
★  filtration
★  bulk flow
  diffusion
  simple diffusion
  independent innovation
  advection
  osmosis worksheet
  innovation
  adoption
  drift
  drift current
  dialysis
  cultural integration
  dissolving
  migration
  confusion
  molecular weight
  dissemination
  dissolution
  osmosis venn diagram
  osmosis quiz
  passive diffusion
  facilitated
  dither
  cultural leveling

Your alternative for diffusion is not listed? Suggest!
Speaking about diffusion, one probably shouldn't forget about concentration gradient.

Other search terms related to diffusion and their ratings are:
★★★★★ concentration gradient
★★★★ convergence
★★ active transport
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Google Trends

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diffusion
osmosis
active transport