warship
艦 centers on a large military vessel: a warship. It is specifically a ship built for combat, not a general boat.
艦 combines 舟 (boat) with 監, which likely contributes the sound カン and may carry a sense of overseeing or inspecting, fitting a command warship.
A boat 舟 that oversees or inspects 監 the seas: a powerful warship keeping watch.
For カン, imagine a can of ammunition being loaded onto the warship: can -> カン, and the ship is ready for battle.
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warship
(naval) fleet; armada
battleship
captain (of a warship)
warship; battleship
flagship
cruiser (warship)
carrying aboard a warship
warships and other vessels
mother ship
naval vessels; warships
bridge (e.g. on a warship)
enemy ship
boarding a warship; serving on a warship
aboard a warship
naval review
Pacific fleet
gunboat
steering a warship
consort ship