Collocations for sea - noun

calm
a calm sea after the storm

choppy, heavy, mountainous (esp. BrE), raging, rough, stormy
A week of heavy seas has created problems for fishermen.
The sea was too rough for sailing in small boats.

deep, shallow
blue, grey/gray
cold, frozen
warm
salty
inland
open
The fishing boats headed for the open sea.

cross
Thousands of Haitians tried to cross the sea to Florida.

roam, sail
He has sailed the seven seas.

go to (= become a sailor)
put out to, put to
The ship put to sea (= left port) in deteriorating weather conditions.

be lost at
They were lost at sea when their ship sank en route for Madeira.

stare out to
She stood on the cliff, staring out to sea.

overlook
a house overlooking the sea

rise
In recent years the sea has risen by a couple of inches.

recede
The sea has receded since the river was diverted.

water
bed, bottom, floor
level
The island is sinking into the ocean due to rising sea levels.

conditions
treacherous sea conditions around Greenland

air, breeze
ice
creature
otter, trout, turtle, urchin, etc.
port (usually seaport)
voyage
cliff, front, view
chantey (AmE), shanty (BrE)
salt
power
the rise of British sea power in the 17th and 18th centuries

at sea
We spent three weeks at sea.

across the sea
We sailed across the Black Sea in a yacht.

by sea
We sent our furniture by sea.

by the sea
They live by the sea.

down to the sea
We'll go down to the sea for a swim before dinner.

in the sea, into the sea
I love swimming in the sea!

on the sea
three ships sailing on the sea

out to sea
She fell overboard and was swept out to sea.

the bottom of the sea, the depths of the sea, the edge of the sea, the middle of the sea, the surface of the sea
above sea level, at sea level, below sea level
The camp is situated 6 755 feet above sea level.

on the high seas
the seven seas

endless, vast

be surrounded by
They were surrounded by a sea of boxes.

sea of
She scanned the vast sea of faces below her.