battlefield
battleground
battleship
combat ship
destroyer
dreadnaught
flagship
fleet
gunboat
minesweeper
naval
naval battle
naval blockade
naval campaign
naval division
naval forces
naval missile
naval radar
naval vessels
naval warfare
naval weaponry
navy
pocket battleship
royal navy
sea going military vessel
seaborne
the frontline
troopship
us navy
ussr
war vessel
war zone
warship