"Nonadditive" 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

"nonadditive" Definition

  1. not having a numerical value equal to the sum of values for the component parts
  2. of, relating to, or being a genetic effect that is not additive

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