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WordNet-Online
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Noun riser has 3 senses
- 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
- riser, riser pipe, riser pipeline, riser main - a vertical pipe in a building
--2 is a kind of pipe, pipage, piping
- 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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