Yes, step is playable
...and is worth 7 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Step" Definition
noun
A degree in progress or a grade or rank in a scale: a step up in the corporate hierarchy.
A fixed rhythm or pace, as in marching: keep step.
A footprint: steps in the mud.
A manner of walking; a particular gait.
A rest for the foot in ascending or descending.
verb-transitive
Computer Science To cause (a computer) to execute a single instruction.
Nautical To place (a mast) in its step.
To furnish with steps; make steps in: terraces that are stepped along the hillside.
To measure by pacing: step off ten yards.
To put or set (the foot) down: step foot on land.
idiom
In step Moving in rhythm.
Out of step Not moving in rhythm: recruits marching out of step.
Step on it Informal To go faster; hurry.
phrasal-verb
Step aside To resign from a post, especially when being replaced.
Step down To reduce, especially in stages: stepping down the electric power.
Step down To resign from a high post.
Step in To enter into an activity or a situation.
verb-intransitive
To move into a new situation by or as if by taking a single step: stepping into a life of ease.
To move with the feet in a particular manner: step lively.
To put or press the foot: step on the brake.
To shift or move slightly by taking a step or two: step back.
To treat someone with arrogant indifference: He is always stepping on other people.
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