helicopter a type of aircraft without wings, that has one or two sets of large blades which go round...
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helicopter
A type of aircraft without wings, that has one or two sets of large blades which go round very fast on top. It can land and take off vertically and can stay in one place in the air
trainA railway engine connected to carriages for carrying people or wheeled containers for carrying goods
van
A medium-sized road vehicle used especially for carrying goods and which often has no windows in the sides of the back half
subway
A railway system in which electric trains travel along passages below ground
An underground passage which allows people on foot to cross a busy road