Is “Strongbox” a Scrabble word?
Yes
STRONGBOX
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 Strongbox
noun
1.A sturdy box with a lock for storing valuables.
Synonyms: safe, safebox