This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A combat ship. Also called man-of-war.

n. Any ship built or armed for naval combat.

n. a government ship that is available for waging war

"A U.S. warship is patrolling waters near Somalia to find a Japanese ship that was hijacked by pirates."

ship    military vehicle   

submersible warship    corvette    aircraft carrier    sloop of war    attack aircraft carrier    torpedo boat    ship of the line    guardship    privateer    destroyer escort   

battleship    cruiser    battle cruiser    destroyer    dreadnought    monitor    frigate   

cruiser    frigate    gunboat    submarine    destroyer    steamer    freighter    men-of-war    bomber    spaceship