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COOLANT
Coolant (noun) — a fluid agent (gas or liquid) that produces cooling; especially one used to cool a system by transferring heat away from one part to another.
“he added more coolant to the car's radiator”
Coolant is a valid 7-letter word worth 9 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.