Yes, stir is playable
...and is worth 4 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Stir" Definition
noun
A disturbance or commotion.
A stirring, mixing, or poking movement.
An excited reaction; a ferment.
verb-intransitive
To be capable of being stirred: a mixture that stirs easily.
To be roused or affected by strong feelings: "His wrath so stirred within him, that he could have struck him dead” ( Charles Dickens).
To change position slightly: The dog stirred in its sleep.
To move about actively; bestir oneself.
To move away from a customary or usual place or position: instructed the guards not to stir from their posts.
verb-transitive
To cause to move or shift, especially slightly or with irregular motion: A breeze stirred the branches.
To excite strong feelings in.
To introduce (an ingredient, for example) into a liquid or mixture: stirred a cup of sugar into the cake batter.
To mix together the ingredients of before cooking or use: stirred up some popover batter; stirred the paint.
To pass an implement through (a liquid, for example) in circular motions so as to mix or cool the contents: stirred the soup before tasting it.
verb
Arouse strong feeling in (someone); move or excite:.
Move a spoon or other implement round and round in (a liquid or other substance) in order to mix it thoroughly:.
Move or cause to move slightly:.
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