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Valid in Scrabble US · 15 points
1 synonym in 1 meaning · 1 playable in Scrabble US
the working together of two things (muscles or drugs for example) to produce an effect greater than the sum of their individual effects
Up to 15 letters. Type ? or a space for a blank tile, up to two.
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Dictionary: official Scrabble dictionary (US), UK Scrabble Dictionary, Words with Friends ENABLE