"Stablemate" 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

"stablemate" Definition

  1. a horse, especially a racing horse, from the same stable as another horse
  2. (also stable companion) a person or product from the same organization as another person or product

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