riser

• POS: Noun
• HYPHEN: ris=er

CIDE DICTIONARY

riser, n. 

•  One who rises; as, an early riser.  [1913 Webster]
•  The upright piece of a step, from tread to tread.  [1913 Webster]
•  A shaft excavated from below upward.  [1913 Webster]
•  A feed head. See under Feed, n.  [1913 Webster]

OXFORD DICTIONARY

riser, n.
1 a person who rises esp. from bed (an early riser).
2 a vertical section between the treads of a staircase.
3 a vertical pipe for the flow of liquid or gas.