Is “Harden” a Scrabble word?
Yes
HARDEN
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 Harden
/ˈhɑːdn̩/
verb
1.To become hard (tough, resistant to pressure).
2.To make something hard or harder (tough, resistant to pressure).
3.To strengthen.
Synonyms: inure