tall, vertical structure can be made of wood, metal, or a combination of both can be free-standing or attached to the ground can be supported by cables or poles can have a platform at the top can have a flag, antenna, or other equipment at the top
mast which has tall, vertical structure mast which can be made of wood, metal, or a combination of both mast which can be free-standing or attached to the ground mast which can be supported by cables or poles mast which can have a platform at the top mast which can have a flag, antenna, or other equipment at the top