Is “Tuff” a Scrabble word?
Yes
TUFF
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 Tuff
/tʌf/
noun
1.A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
Synonyms: tufa