Answer:

rollercoaster

Answer	Crossword Clue
ROLLERCOASTER	Carnival thriller
ROLLERCOASTER	Coney Island Cyclone, for one
ROLLERCOASTER	It has its ups and downs

ROLLERCOASTER	Theme-park sight
ROLLERCOASTER	Thrilling ride
ROLLERCOASTER	Transit to nowhere
ROLLERCOASTER	Amusement park scream provoker
ROLLERCOASTER	TERROR'S LOCALE?
ROLLERCOASTER	Scream elicitor
ROLLERCOASTER	Theme park part
ROLLERCOASTER	BIG DIPPER

ROLLERCOASTER	Ups and downs