Answer:

nurl

Answer	Crossword Clue
NURL	Knot in wood: var.
NURL	Knot in wood: Var.
NURL	Roughen.

NURL	Ridge on the edge of a coin: Var.
NURL	Ridge on a coin edge: Var.
NURL	Wood knot

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.