The best replacement for skeleton is luge.

The best alternatives to skeleton are rated as following:
★★★★★  luge
★★  zombie
★  appendicular skeleton
★  luge faster
★  creeper
★  bootstrap
★  skeleton
★  female skeleton
★  html5 boilerplate
  luge sled
  animal skeleton
  monkey skeleton
  cresta
  human skeleton
  exoskeleton
  bobsled
  fluid filled skeleton
  mutant zombie
  buttons
  luge difference
  male skeleton
  wither skeleton
  skeletal
  bobsledding
  zombie minecraft
  caucasian skeleton
  mutant enderman
  skellington
  equine skeleton
  axial skeleton

Your alternative for skeleton is not listed? Suggest!
Speaking about skeleton, one probably shouldn't forget about internal organs.

Other search terms related to skeleton and their ratings are:
★★★★★ internal organs
★ all the bones labeled
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skeleton
luge
zombie