Scrabble Dictionary

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Yes, nock is playable

...and is worth 12 points.

Found in the following dictionaries

Enable (Words with friends)
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OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Nock" Definition

noun

The groove at either end of a bow for holding the bowstring.
The notch in the end of an arrow that fits on the bowstring.
One of the notches cut in either of two tips of horn fastened on the ends of a bow or in the bow itself for holding the string.
The part of an arrow having a notch for the bowstring.
The notch itself.

verb-transitive

To fit (an arrow) to a bowstring.
To put a nock in (a bow or arrow).

verb

To make a nock in (a bow or arrow).
To fit (an arrow) against the bowstring.