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bum (informal) a poor person with no home and no job; tramp. [3 definitions]
bumblebee a large, furry bee, often with black and yellow stripes. Bumblebees make a loud humming or buzzing noise when they fly.
bump to knock against or hit, often by accident. [7 definitions]
bumper the heavy bar on the front and back of cars and trucks that protects the vehicle from damage if it hits something. [2 definitions]
bumper car one of a number of miniature electric cars that are part of an amusement at a fair or carnival. People ride in the cars and try to bump into other cars or escape from being bumped. The cars are designed to be safe and enjoyable for the riders.
bump into (informal) to meet by accident or chance.
bun a loaf of bread small enough for a single serving; roll. [2 definitions]
bunch a number of things of the same kind that are attached together. [4 definitions]
bundle a number of things that have been tied or packed together. [3 definitions]
bundle up to dress in warm, thick clothing.
bungalow a small, cozy house; cottage.
bunk1 a small, single bed attached to a wall. [2 definitions]
bunny (informal) an animal with long ears, a short tail, and soft fur; a young rabbit.
Bunsen burner a burner that has holes at the bottom where air enters, mixes with gas, and makes a hot blue flame. Bunsen burners are used in laboratory experiments.
bunt1 to tap with a baseball or softball bat so that the ball lands close by. [2 definitions]
buoy a float attached by line to the bottom of a body of water to mark a location. [3 definitions]
buoyancy the capacity to float or rise to the top in a liquid or gas.
buoyant able to float or keep something else floating. [2 definitions]
bur the prickly and sharp covering for the seed of some plants. [2 definitions]
burden1 something that is carried or difficult to bear. [2 definitions]
bureau a chest of drawers. [3 definitions]