Answer:

niggle

Answer	Crossword Clue
NIGGLE	Be a fussbudget
NIGGLE	Be finicky
NIGGLE	Nitpick

NIGGLE	Carp
NIGGLE	Work over trivia.
NIGGLE	Work fussily.
NIGGLE	Trifle
NIGGLE	Find fault
NIGGLE	Trifle with
NIGGLE	Penny-pinch
NIGGLE	Carp pettily

NIGGLE	Pettifog
NIGGLE	Criticize in a petty way
NIGGLE	Criticize pettily
NIGGLE	Be nitpicky

Crossword

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