big wave
breaker
breaking wave
cascading wave
challenging
coast
coastal
coastline
crashing wave
crest
danger
dangerous
dangerous surf
dangerous wave
fluid
frightening
groundswell
hazardous surf
heavy sea
impending
incoming wave
intimidating
liquid
looming
menacing
ocean
open ocean
open water
power
powerful wave
precarious
rough sea
rough water
sea
seaboard
seascape
seashore
stormy weather
surf
swell
threatening
treacherous
turbulent
water
water in motion
wave
whitewash
whitewater