"Phosphonium" 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

"phosphonium" Definition

  1. a monovalent cation PH4+ analogous to ammonium and derived from phosphine

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