Yes, cyst is a Scrabble word!
...and is worth 9 points in Scrabble, and 9 points in Words with Friends
cyst
Noun
1. A closed sac that develops abnormally in some body structure
2. A small anatomically normal sac or bladderlike structure (especially one containing fluid)
What Scrabble words can I make with the letters in cyst?
3 Letter Words
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Words that can be created with an extra letter added to cyst:
S:cysts