(n) boathouse
(n) boat race
(n) board game
(n) (comp) baud rate
(n) board-level
(n) bowling alley
(n) ball girl (as in tennis)
(n) ball game
(n) ball boy
(n) ballroom
(n) bonehead
(n) body board
(n) (comp) motherboard
(n) meatball
(n) mirror ball
(n) mince ball
(n) (comp) main board
(n) meatball (wasei: mince ball)
(n) (arch) modern boy (slang circa the 1920s)
(n) large ball
(n) lifeboat
(n) rib vault
(n) lost ball
(n) art nouveau (fre:)
(n) (comp) add-on board
(n) (comp) analog board
(n) ether(net) board
(n) waste ball
(n) waste ball (baseball)
taking a pitch
(n) emery board