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A unicycle is a bicycle with only one wheel. The "uni" at the start of the word means one, just like the "bi" on bicycle means two, and the "tri" on tricycle means three.
Because unicycles only have one wheel they are hard to ride and hard to steer, and they are not seen very often outside of circuses.
A van is a type of small truck that is used to carry small, covered loads around. Vans are often used by tradespeople like electricians and to deliver small furniture.
Wis forWheelbarrow
A wheelbarrow is something you use in the garden or on a building site to move things around that are too heavy to carry yourself. They have handles at one end to push and a wheel at the other end. Wheelbarrows only have one wheel so they are easy to steer, and so you can tip them up and drop whatever is in the wheelbarrow into a pile on the ground. Wheelbarrows are very good for moving dirt, soil and gravel.
Wis forWheelchair
A wheelchair is, as the name suggests, a chair with wheels. The back wheels are very big and usually have a handle running around the edge of them so you can push the chair along using your hands.
Some wheelchairs are powered by a small motor, for people who don't have strong enough arms to push them along themselves. They have a little steering stick on one of the arms of the chair.
Other wheelchairs are just for moving people around short distances like in a hospital, and the person sitting in the chair can't move them at all. These wheelchairs have handles on the back so someone like a nurse is needed to push them around.
A yacht is a type of fast sailing boat. Sailboats do not have engines or motors, they move because the wind blows them along.