Collocations for ocean - noun

deep
vast
great
a vessel which can explore the depths of the great oceans

blue
open
A storm started up once we got out into the open ocean.

calm, rough
endless (literary)
Before him lay the vast, endless ocean.

cold, frozen
tropical, warm
southern
penguins of the southern oceans

coastal (AmE)

cross, sail
explore
go in, swim in (both esp. AmE)
overlook (esp. AmE)
a beach house overlooking the ocean

depths
the darkness of the ocean depths

surface
bed, bottom, floor
basin
water
ecosystem
wave
a life on the ocean wave (= at sea)

current, tides
air, breeze (both esp. AmE)
voyage
liner
view
blue

across the ocean
trade across the Atlantic Ocean

in the ocean
Various toxic substances have been dumped in the ocean.

the bottom of the ocean, the depths of the ocean, the middle of the ocean, the surface of the ocean
the oceans of the world, the world's oceans
great ships that sailed the oceans of the world