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Noun riser has 3 senses
  1. riser - a person who rises (especially from bed); "he's usually a late riser"
    --1 is a kind of     person, individual, someone, somebody, mortal, human, soul
    --1 has particulars: early bird
    Derived forms: verb rise10, verb rise3
  2. riser, riser pipe, riser pipeline, riser main - a vertical pipe in a building
    --2 is a kind of pipe, pipage, piping
  3. riser - structural member consisting of the vertical part of a stair or step
    --3 is a kind of     structural member
    --3 is a part of step, stair
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