Is “Slumber” a Scrabble word?
Yes
SLUMBER
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 Slumber
/slʌmbə/
noun
1.A very light state of sleep, almost awake.
2.A state of ignorance or inaction.
verb
1.To be in a very light state of sleep, almost awake.
2.To be inactive or negligent.
3.To lay to sleep.