The best replacement for sneak is snuck.

The best alternatives to sneak are rated as following:
★★★★★  snuck
★★★★★  sneek
★★★  muffle
★★  angello
★  troxler
★  muffle skyrim
★  voorn
★  deadmau5
★  seth troxler
★  warrior skyrim
★  shm
★  metropolis
★  sneak
★  shadow claw
★  shadow punch
  semi sneak
  invisibility
  muffle sky rim
  bust in
  semi upright

Your alternative for sneak is not listed? Suggest!
Speaking about sneak, one probably shouldn't forget about heavy armor.

Other search terms related to sneak and their ratings are:
★★★★★ heavy armor
★★★★ archery
★★★ illusion
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Google Trends

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