Is “Riff” a Scrabble word?
Yes
RIFF
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 Riff
/ɹɪf/
noun
1.A repeated instrumental melody line in a song.
“Listen to one of the greatest guitar riffs of all time!”
2.A clever or witty remark.
3.A variation on something.
verb
1.To improvise in the performance or practice of an art, especially by expanding on or making novel use of traditional themes.
2.To riffle.