Is “Nock” a Scrabble word?
Yes
NOCK
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Nock
/ˈnɒk/
noun
1.Either of the two grooves in a bow that hold the bowstring.
2.The notch at the rear of an arrow that fits on the bowstring.
3.The upper fore corner of a boom sail or trysail.
verb
1.To fit an arrow against the bowstring of a bow or crossbow. (See also notch.)
2.To cut a nock in (usually in an arrow's base or the tips of a bow).