Convolutional is valid Scrabble Word

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

Definitions for CONVOLUTIONAL in dictionary:

Similar words containing NVOLUTION without suffix al and without prefix co

involution13 convolution16 involutions14 convolutions17 involutional15 subinvolution18 convolutionary22 subinvolutions19 hyperinvolution26 hyperinvolutions27
Find what other words can be done using letters: "convolutional"
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