Is “Sizable” a Scrabble word?
Yes
SIZABLE
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 Sizable
/ˈsaɪzəbəl/
adjective
1.Fairly large.
“He gave a sizable cash donation, sizable enough that the IRS wondered where all that money came from.”