Is “Hallmark” a Scrabble word?
Yes
HALLMARK
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 Hallmark
/ˈhɔːlmɑːk/
noun
1.A distinguishing characteristic.
2.An official marking made by a trusted party, usually an assay office, on items made of precious metals.
verb
1.To provide or stamp with a hallmark.