Riser
Riser , noun
1.
One who rises; as, an early riser.
2.
(a) (Architecture) The upright piece of a step, from tread to tread.
(b)
(Architecture) Any small upright face, as of a seat, platform, veranda, or the like.
3.
(Mining) A shaft excavated from below upward.
4.
(Founding) A feed head. See under Feed, n.