Is “Firth” a Scrabble word?
Yes
FIRTH
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 Firth
/fɜːθ/
noun
1.An arm or inlet of the sea; a river estuary.