A two-masted vessel, square-rigged on both foremast and mainmast
Bridge.
Brigadier.
A jail or guardhouse, especially in a naval military prison or jail on a ship, navy base, or (in fiction) spacecraft.
A sailing warship, smaller than a frigate, with its guns all on one deck.
A single-masted sailboat with only one headsail.
A sloop-of-war, smaller than a frigate, larger than a corvette.