"Systematics" 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

"systematics" Definition

  1. the science of classification
  2. a system of classification
  3. the classification and study of organisms with regard to their natural relationships : TAXONOMY

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