Yes, posies is a Scrabble word!
...and is worth 8 points in Scrabble, and 9 points in Words with Friends
posies
Noun
1. An arrangement of flowers that is usually given as a present
What Scrabble words can I make with the letters in posies?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words