Another great ocean word, oft misunderstood, is (tada!):

Ground

And some others:

Surges
Tidal Waves
tsunami
Edited out the "s" and replaced with "n"--thanks, Faldage!
Riptide
Ebbtide
Surf
Tide pools
Undertow

Beached regards,
WordWave

PS: How do you spell "tsusami"? Can't figure it out. tsunami
...got it, Faldage!