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 small armed vessel.

n. Any of various types of small armed vessel

n. A vessel of light draught, carrying one or more guns, used for operations in shallow waters.

n. Any small naval vessel carrying mounted guns.

n. A boat or small vessel fitted to carry one or more guns of large caliber, and from its light draft capable of running close inshore or up rivers; also, any small vessel carrying guns.

n. In coal-mining, a self-dumping box on wheels, used for raising coal on slopes, and holding three or four tons of coal. It resembles a “skip,” but runs on wheels, and not between guides.

n. a small shallow-draft boat carrying mounted guns; used by costal patrols

"Turkey is not a world power and they are not going to engage in gunboat diplomacy just to satisfy your desire to get even with Israel."

boat   

patrol boat    mortar barge    monitor    cutter    torpedo boat   

gunboat diplomacy   

tinclad   

warship    frigate    corvettes    men-of-war    privateer    brig    destroyer    man-of-war    flagship    flotilla