Yes, quench is a Scrabble word!
...and is worth 20 points in Scrabble, and 22 points in Words with Friends
quench
Verb
1. Satisfy (thirst)
2. Put out, as of fires, flames, or lights
3. Electronics: suppress (sparking) when the current is cut off in an inductive circuit, or suppress (an oscillation or discharge) in a component or device
4. Suppress or crush completely
5. Reduce the degree of (luminescence or phosphorescence) in (excited molecules or a material) by adding a suitable substance
6. Cool (hot metal) by plunging into cold water or other liquid
What Scrabble words can I make with the letters in quench?
3 Letter Words
2 Letter Words