Answer:

jeerer

Answer	Crossword Clue
JEERER	One who heckles
JEERER	One who scoffs
JEERER	Fan that's unhappy

JEERER	Scoffer.
JEERER	One kind of baseball fan.
JEERER	Mocking one.
JEERER	Rude critic
JEERER	"Boo bird"
JEERER	One who hoots
JEERER	Heckler
JEERER	Vocal opponent

JEERER	Boo-bird, e.g.

Crossword

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