Irresistable is valid Scrabble Word

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

Definitions for IRRESISTABLE in dictionary:

How to use IRRESISTABLE in a sentence

Find what other words can be done using letters: "irresistable"
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