The best replacement for peek is peak.

The best alternatives to peek are rated as following:
★★★★★  peak
★★★  ptfe
★  delrin
★  ultem
★  gitaxian probe
★  pei
★  peep
★  allograft
★  sneak peak
  gurney
  pps
  autosol
  uhmwpe
  torlon
  peek
  pique
  polyimide
  titanium cages
  take a peak
  sneak peek

Your alternative for peek is not listed? Suggest!
Speaking about peek, one probably shouldn't forget about carbon fiber.

Other search terms related to peek and their ratings are:
★★★★★ carbon fiber
You have in mind a companion for peek and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of peek in all years. Click on graph for more.
peek
peak
ptfe