| outboard | (adjective) located away from the midline of a vessel or aircraft | - |
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| (noun) internal-combustion engine that mounts at stern of small boat | Synonyms: outboard motor |
| (noun) a motorboat with an outboard motor | Synonyms: outboard motorboat |
| overboard | (adverb) from on board a vessel into the water | - |
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| (adverb) to extremes | - |
| paperboard | (noun) a cardboard suitable for making posters | Synonyms: poster board, posterboard |
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| pasteboard | (noun) stiff cardboard made by pasting together layers of paper | - |
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| patchboard | (noun) telephone central where circuits are completed with patchcords | Synonyms: plugboard, switchboard |
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| pegboard | (noun) a board perforated with regularly spaced holes into which pegs can be fitted | - |
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| pigboat | (noun) a submersible warship usually armed with torpedoes | Synonyms: sub, submarine |
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| plasterboard | (noun) wallboard with a gypsum plaster core bonded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls | Synonyms: gypsum board |
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| plugboard | (noun) telephone central where circuits are completed with patchcords | Synonyms: patchboard, switchboard |
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| plyboard | (noun) a laminate made of thin layers of wood | Synonyms: plywood |
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| posterboard | (noun) a cardboard suitable for making posters | Synonyms: paperboard, poster board |
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| powerboat | (noun) a boat propelled by an internal-combustion engine | Synonyms: motorboat |
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| punchboard | (noun) a small board full of holes; each hole contains a slip of paper with symbols printed on it; a gambler pays a small sum for the privilege of pushing out a slip in the hope of obtaining one that entitles him to a prize | - |
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| rowboat | (noun) a small boat of shallow draft with cross thwarts for seats and rowlocks for oars with which it is propelled | Synonyms: dinghy, dory |
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| sailboat | (noun) a small sailing vessel; usually with a single mast | Synonyms: sailing boat |
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| sauceboat | (noun) a dish (often boat-shaped) for serving gravy or sauce | Synonyms: boat, gravy boat, gravy holder |
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| scoreboard | (noun) a large board for displaying the score of a contest (and some other information) | - |
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| seaboard | (noun) the shore of a sea or ocean regarded as a resort | Synonyms: seaside |
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| shipboard | (adjective) casual or ephemeral as if taking place on board a ship | - |
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| shovelboard | (noun) a game in which players use long sticks to shove wooden disks onto the scoring area marked on a smooth surface | Synonyms: shuffleboard |
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| showboat | (noun) a river steamboat on which theatrical performances could be given (especially on the Mississippi River) | - |
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| shuffleboard | (noun) a game in which players use long sticks to shove wooden disks onto the scoring area marked on a smooth surface | Synonyms: shovelboard |
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| sideboard | (noun) a piece of furniture that stands at the side of a dining room; has shelves and drawers | Synonyms: buffet, counter |
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| (noun) a board that forms part of the side of a bed or crib | - |
| (noun) a removable board fitted on the side of a wagon to increase its capacity | - |
| signboard | (noun) structure displaying a board on which advertisements can be posted | Synonyms: sign |
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| skateboard | (noun) a board with wheels that is ridden in a standing or crouching position and propelled by foot | - |
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| (verb) ride on a flat board with rollers attached to the bottom | - |
| skateboarder | (noun) someone who skates on a skateboard | - |
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| skateboarding | (noun) the sport of skating on a skateboard | - |
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| snowboard | (noun) a board that resembles a broad ski or a small surfboard; used in a standing position to slide down snow-covered slopes | - |
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| (verb) glide down a snow-covered slope while standing on a board | - |
| snowboarder | (noun) someone who slides down snow-covered slopes while standing on a snowboard | - |
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| snowboarding | (noun) the act of sliding down a snow-covered slope while standing on a snowboard | - |
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| soundboard | (noun) (music) resonator consisting of a thin board whose vibrations reinforce the sound of the instrument | Synonyms: sounding board |
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| speedboat | (noun) a fast motorboat | - |
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| splashboard | (noun) protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side | Synonyms: washboard |
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| (noun) protective covering consisting of a panel to protect people from the splashing water or mud etc. | Synonyms: dashboard, splasher |
| springboard | (noun) a beginning from which an enterprise is launched | Synonyms: jumping-off point, point of departure |
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| (noun) a flexible board for jumping upward | - |
| starboard | (adjective) located on the right side of a ship or aircraft | - |
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| (noun) the right side of a ship or aircraft to someone who is aboard and facing the bow or nose | - |
| (verb) turn to the right, of helms or rudders | - |
| steamboat | (noun) a boat propelled by a steam engine | - |
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| strawboard | (noun) a coarse yellow cardboard made of straw pulp | - |
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| surfboard | (noun) a narrow buoyant board for riding surf | - |
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| (verb) ride the waves of the sea with a surfboard | Synonyms: surf |
| surfboarder | (noun) someone who engages in surfboarding | Synonyms: surfer |
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| surfboarding | (noun) the sport of riding a surfboard toward the shore on the crest of a wave | Synonyms: surfing, surfriding |
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| surfboat | (noun) a boat that can be launched or landed in heavy surf | - |
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| switchboard | (noun) telephone central where circuits are completed with patchcords | Synonyms: patchboard, plugboard |
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| tailboard | (noun) a gate at the rear of a vehicle; can be lowered for loading | Synonyms: tailgate |
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| teeterboard | (noun) a plaything consisting of a board balanced on a fulcrum; the board is ridden up and down by children at either end | Synonyms: dandle board, seesaw, teeter-totter, teeter, teetertotter, tilting board |
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| towboat | (noun) a powerful small boat designed to pull or push larger ships | Synonyms: tower, tug, tugboat |
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| tugboat | (noun) a powerful small boat designed to pull or push larger ships | Synonyms: towboat, tower, tug |
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| wakeboard | (noun) a buoyant board (resembling a surfboard) that is used to ride over water while being pulled behind a motorboat | Synonyms: wake board |
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| wallboard | (noun) a wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses | Synonyms: dry wall, drywall |
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| washboard | (noun) protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side | Synonyms: splashboard |
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| (noun) device consisting of a corrugated surface to scrub clothes on | - |
| waterboarding | (noun) torture where water is poured over the face of a captive simulating drowning | - |
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| weatherboard | (noun) the side toward the wind | Synonyms: weather side, windward side |
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| (noun) a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below | Synonyms: clapboard, weatherboarding |
| weatherboarding | (noun) a long thin board with one edge thicker than the other; used as siding by lapping one board over the board below | Synonyms: clapboard, weatherboard |
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| whaleboat | (noun) a long narrow boat designed for quick turning and use in rough seas | - |
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| workboard | (noun) a horizontal board that provides a supported surface for manual work | Synonyms: work-board |
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