Matterless is valid Scrabble Word

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

Definitions for MATTERLESS in dictionary:

Words related to MATTERLESS

matter8
Find what other words can be done using letters: "matterless"
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