Bush is another word for a shrub. Bush can also be used to describe a wilderness area that has bushes and trees in it.
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A busker is someone who performs music, or sometimes dance or other entertaining performance, in a public place. People give buskers money for their performance. Buskers usually have some sort of container on the ground near them for people to put the money in. A more general term for a busker is street performer.
A butcher is someone who cuts dead animals up into small pieces that are suitable to make into meals, and then sells them. Some butchers kill the animals and prepare them too.