Kiff is valid Scrabble Word

Is kiff a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List NO
Collins Scrabble Words YES
Is kiff valid Words with Friends?
Words with Friends NO

Definitions for KIFF in dictionary:

Words that contain KIFF

skiff15 skiffs16 skiffed18 skiffle17 skiffing19 skiffled19 skiffles18 skiffless19 skiffling20
Find what other words can be done using letters: "kiff"
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