"Koppa" 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

"koppa" Definition

  1. a letter of the early Greek alphabet replaced by kappa in the eastern Greek alphabet except for use as a numeral with the value 90 but retained in the western Greek alphabet and ultimately becoming the Latin letter Q

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