The best replacement for knight is samurai.

The best alternatives to knight are rated as following:
★★★★★  samurai
★★★★  bishop
★★  knave
★★  warrior dark souls
★★  pirate
★★  dragon
★★  warrior dark souls 2
★★  paladin
★  rook
★  giant
★  spartan
★  knight
★  gladiator
★  warrior rotmg
★  viking
★  titanic
★  warrior
★  cleric dark souls
★  bishop worth more
  cavalier amelia
  nugent
  crusader
  rook endgame
  consular
  bishop better
  warrior wonderking
  crusader ragnarok
  warrior ro2
  jewett
  lord
  sorcerer
  conquer
  gladiator dragonica
  dark knight rises
  japanese samurai
  pyromancer dark souls
  liz jones
  myphone vortex
  warlock
  dr dre
  blade
  mary washington asparagus
  blade flyff
  elite knight
  kirby
  danson
  akon
  bandit dark souls
  assassin cross
  night
  king and queen
  king and rook
  gene keady

Your alternative for knight is not listed? Suggest!
Speaking about knight, one probably shouldn't forget about heath ledger.

Other search terms related to knight and their ratings are:
★★★★★ heath ledger
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Google Trends

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knight
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