Antonyms:

fresh water, freshwater

water that is not salty

types:

red tide

seawater that is discolored by large numbers of certain dinoflagellates that produce saxitoxin

type of:

H2O, water

binary compound that occurs at room temperature as a clear colorless odorless tasteless liquid; freezes into ice below 0 degrees centigrade and boils above 100 degrees centigrade; widely used as a solvent