Yes, mains is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
mains
Noun
1. Any very large body of (salt) water
2. A principal pipe in a system that distributes water or gas or electricity or that collects sewage
What Scrabble words can I make with the letters in mains?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words