Subclassing is valid Scrabble Word

Is subclassing a scrabble word?
Official Scrabble Players Dictionary YES
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is subclassing valid Words with Friends?
Words with Friends YES

Definitions for SUBCLASSING in dictionary:

Words related to SUBCLASSING

subclass12 subclassed15 subclasses14
Find what other words can be done using letters: "subclassing"
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