Is “Riser” a Scrabble word?
Yes
RISER
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Riser
/ˈɹaɪ.zə(ɹ)/
noun
1.Someone or something which rises.
2.A platform or stand used to lift or elevate something.
“The choir stood on risers for the performance.”
3.The vertical part of a step on a staircase.