Irresolvability is valid Scrabble Word

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

Definitions for IRRESOLVABILITY in dictionary:

Similar words containing RESOLVABIL without suffix ity and without prefix ir

resolvability21 resolvabilities20
Find what other words can be done using letters: "irresolvability"
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