PST Scrabble Word

Is PST a scrabble word?

PST is a scrabble word that worth 5 points.

PST (noun)

standard time in the 8th time zone west of Greenwich, reckoned at the 120th meridian west; used in far western states of the United States.
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There are 3 letters P S T to form a word: PST. From the combination of these letters, we can form 2 scrabble words as the following:

3 Letters
2 Letters