Yes, gist is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
gist
Noun
1. The central meaning or theme of a speech or literary work
2. The choicest or most essential or most vital part of some idea or experience
What Scrabble words can I make with the letters in gist?
4 Letter Words
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3 Letter Words
2 Letter Words