Xyst is a 4 letter English word. It's valid Scrabble word worth 14 points. It's valid Words with friends word worth 13 points.
You can make 16 anagrams from letters in xyst (stxy).
1655-65; Latin xystus garden terrace, shaded walk Greek xystós a covered colonnade
xyst, zist, n. a covered portico used by athletes for their exercises.