Yes, plena is a Scrabble word!
...and is worth 7 points in Scrabble, and 10 points in Words with Friends
plena
Noun
1. A meeting of a legislative body at which all members are present
2. An enclosed space in which the air pressure is higher than outside
What Scrabble words can I make with the letters in plena?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words