ocean

nouns

a large body of water constituting a principal part of the hydrosphere
is derived from
is derived from
is a part of
the watery layer of the earth's surface; includes water vapor
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"
anything apparently limitless in quantity or volume
is derived from