The best replacement for armor is armour.

The best alternatives to armor are rated as following:
★★★★★  armour
★★  lifeproof
★★  synthroid
★★  health
★  vitality diablo 3
★  evasion path of exile
★  infantry
★  all resist
★  stamina
★  bullet proof vest
★  magic resist
★  health lol
★  defender
★  heavy armor
★  preserver
★  invisible shield
★  health league of legends
★  frontline
★  life diablo 3
★  minigun fallout 3
★  bulletproof vest
★  resist all
★  weapon
★  health league
  recon armor
  dodge runes
  flame body
  infantry officer
  armor per level
  stamina wow
  scaling armor
  minigun
  cavalry
  ice armor
  light armor
  evasion
  field artillery
  stam
  energy shield
  health runes
  power armor
  dragon armor
  weapons
  vitality witcher 2
  herculiner
  frontline plus
  firearms
  hp lol
  daderick
  demon armor
  resistance diablo 3
  dragon skin
  michelin ltx ms2
  bulletproof vests
  amour
  otterbox
  knight armor
  devastate
  all res
  invisishield
  bullet proof vests
  pet armor plus

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

Other search terms related to armor and their ratings are:
★★★★★ kevlar
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Google Trends

Scale is based on the average worldwide traffic of armor in all years. Click on graph for more.
armor
armour
lifeproof