The best replacement for submarine is submarine.

The best alternatives to submarine are rated as following:
★★★★★  submarine
★★★★  destroyer
★★★★  aircraft carrier
★★★  submersible
★★  hoagie
★★  ship
★  battleship
★  blue whale
★  submarine ww2
  hero
  us submarine
  u-boat
  u boat
  nuclear submarine
  surface ship
  russian submarine
  seawolf

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submarine
submarine
destroyer