sql server cross db update

I have a query which works on the select but I dont know how to create the update so thattw.marque in tblwords in db dictionary get updated to tcwa.sCWDescGroup from the clientdata db

--UPDATE [dictionary].[dbo].[TblWords]
--SET tw.Marque=tcwa.sCWDescGroup
SELECT tw.ClientCode, tab2.[MVRIS CODE], tab2.MARQUE, tcwa.sCWDesc, tcwa.sCWDescGroup, tcwa.sCWTechnicalGroup
FROM [dictionary].[dbo].[TblWords] tw
    INNER JOIN [clientdata].[dbo].[smmt] tab2
        ON tw.ClientCode = tab2.[MVRIS CODE]
		 inner JOIN ClientData.[dbo].[tCWAlias] tcwa ON tab2.MARQUE=tcwa.sCWDesc
		 WHERE tcwa.sCWTechnicalGroup='name'
		 group BY tw.ClientCode, tab2.[MVRIS CODE], tab2.MARQUE, tcwa.sCWDesc, tcwa.sCWDescGroup, tcwa.sCWTechnicalGroup

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