Yes, warm is playable
...and is worth 10 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Warm" Definition
noun
Informal A warming or heating.
verb-intransitive
To become ardent, enthusiastic, or animated: began to warm to the subject.
To become kindly disposed or friendly: She felt the audience warming to her.
To become warm: The rolls are warming in the oven.
verb-transitive
To fill with pleasant emotions: We were warmed by the sight of home.
To make zealous or ardent; enliven.
To raise slightly in temperature; make warm: warmed the rolls a bit more; warm up the house.
phrasal-verb
Warm up To approach a state of confrontation or violence.
Warm up To make more enthusiastic, excited, or animated.
Warm up To make or become ready for an event or operation.
Warm up To prepare for an athletic event by exercising, stretching, or practicing for a short time beforehand.
verb
To infuse with a feeling of love, friendship, well-being, or pleasure.
To fill with anger, zeal, or passion.
To reheat (cooked food) for eating.
To make ready for operation or performance by preliminary exercise or operation.
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