Answer:

nettler

Answer	Crossword Clue
NETTLER	One who irritates.
NETTLER	Heckler.
NETTLER	Irritating fellow.

NETTLER	Vexatious person
NETTLER	Provoking person
NETTLER	Irritant

Crossword

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