Is “Sis” a Scrabble word?
Yes
SIS
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 Sis
/sɪs/
noun
1.A daughter of the same parents as another person; a female sibling.
“My sister is always driving me crazy.”
2.A female member of a religious order; especially one devoted to more active service; (informally) a nun.
“Michelle left behind her bank job and became a sister at the local convent.”
3.Any butterfly in the genus Adelpha, so named for the resemblance of the dark-colored wings to the black habit traditionally worn by nuns.
Synonyms: affiliate, affiliated, charge nurse, darling, dear, lady