Whiss is valid Scrabble Word

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

Definitions for WHISS in dictionary:

Words related to WHISS

hiss7 whissed14 whisses13 whissing15
Find what other words can be done using letters: "whiss"
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