Yes, pentad is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
pentad
Noun
1. The cardinal number that is the sum of four and one
What Scrabble words can I make with the letters in pentad?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words