Is “Postfix” a Scrabble word?
Yes
POSTFIX
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 Postfix
/ˈpəʊst.fɪks/
noun
1.Suffix.
verb
1.To suffix.
2.To subject a sample to postfixation