Is “Headquarter” a Scrabble word?
Yes
HEADQUARTER
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 Headquarter
verb
1.To provide (an organization) with headquarters.
2.To establish headquarters.