Answer:

ROAR

Answer	Crossword Clue
ROAR	Bellow
ROAR	Crowd sound
ROAR	Engine sound

ROAR	Grandstand sound
ROAR	Laugh heartily
ROAR	Leo's cry
ROAR	Ocean sound
ROAR	Stadium sound
ROAR	Twenties sound?
ROAR	Den sound
ROAR	Growl loudly

ROAR	Have a good laugh
ROAR	Hearty sound
ROAR	Crowd's noise
ROAR	Leo's comment
ROAR	Sound of waves
ROAR	Surf sound
ROAR	Niagara feature
ROAR	Simba's cry

ROAR	Sound after a walk-off home run
ROAR	Belly laugh
ROAR	Crowd's tumult
ROAR	Noise of engines
ROAR	Boisterous outcry
ROAR	Guffaw
ROAR	Leonine call
ROAR	Cataract sound

ROAR	Sound of surf
ROAR	Crowd emission
ROAR	Sound of falls
ROAR	2013 Katy Perry hit
ROAR	Jet or surf sound
ROAR	Pride signal
ROAR	Laugh loudly
ROAR	Leonine cry

ROAR	Loud outburst
ROAR	Sound from a den
ROAR	Opening sound of an MGM film
ROAR	Speak thunderously
ROAR	Stadium cheer