Noun rapper has 2 senses
  1. rapper - someone who performs rap music
    --1 is a kind of
    singer, vocalist, vocalizer, vocaliser
  2. knocker, doorknocker, rapper - a device (usually metal and ornamental) attached by a hinge to a door
    --2 is a kind of device
    --2 is a part of front door, front entrance
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