Yes, hisser is a Scrabble word!
...and is worth 9 points in Scrabble, and 8 points in Words with Friends
hisser
Noun
1. Someone who communicates disapproval by hissing
What Scrabble words can I make with the letters in hisser?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words