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riser (n.)

late 14c., risere, "rebel, insurgent, one who rises in revolt," agent noun from rise (v.). Meaning "one who rises" (from bed, in a certain manner) is from mid-15c. Meaning "upright face of a stair-step" is by 1738.

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Definitions of riser from WordNet

riser (n.)
a person who rises (especially from bed);
he's usually a late riser
riser (n.)
a vertical pipe in a building;
Synonyms: riser pipe / riser pipeline / riser main
riser (n.)
structural member consisting of the vertical part of a stair or step;
From wordnet.princeton.edu