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bully1 someone who harasses and frightens others. [2 definitions]
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]
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]
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]
burglar someone who breaks into a building in order to steal something.