sea

nouns

a division of an ocean or a large body of salt water partially enclosed by land
sea
is a part of
the watery layer of the earth's surface; includes water vapor
hydrosphere
is a type of (narrower)
the part of the earth's surface covered with water (such as a river or lake or ocean)
"they invaded our territorial waters"; "they were sitting by the water's edge"
body of water, water
anything apparently limitless in quantity or volume
ocean, sea
turbulent water with swells of considerable size
"heavy seas"
sea
is a type of (narrower)
flow in which the velocity at any point varies erratically
turbulent flow