Yes, peak is playable
...and is worth 11 points.
Found in the following dictionaries
Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)
"Peak" Definition
noun
A tapering, projecting point; a pointed extremity: the peak of a cap; the peak of a roof.
Nautical The outermost end of a gaff.
Nautical The upper after corner of a fore-and-aft sail.
Physics The highest value attained by a varying quantity: a peak in current.
adjective
Approaching or constituting the maximum: working at peak efficiency.
Of, relating to, or being a period of maximum intensity or activity .
Being at or reaching the maximum .
At the highest level; maximum.
verb-transitive
Nautical To raise (a gaff) above the horizontal.
To bring to a maximum of development, value, or intensity.
verb-intransitive
To achieve a maximum of development, value, or intensity: Sales tend to peak just before the holidays.
To be formed into a peak or peaks: Beat the egg whites until they peak.
To become sickly, emaciated, or pale.
verb
To hold (oars) with blades well raised.
To set (as a gaff) nearer the perpendicular.
To cause to come to a peak, point, or maximum.
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