"Classifier" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) Yes

"classifier" Definition

  1. an affix or word that shows that a word belongs to a group of words with similar meanings. For example the prefix ‘un’ is a classifier that shows the word is negative.

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