riser

riser is a   Noun

Definition:

[1] One who rises; as, an early riser.

[2] The upright piece of a step, from tread to tread. Hence:

[3] Any small upright face, as of a seat, platform, veranda, or the like.

[4] A shaft excavated from below upward.

[5] A feed head. See under Feed, n.

Synonyms: