WordNet sense 1 (liquid excretory product):

pee, piddle, piss, urine, weewee

WordNet sense 2 (the part of the earth's surface covered with water (such as a river or lake or ocean)):

body of water

WordNet sense 3 (a facility that provides a source of water):

water system, water supply

WordNet sense 4 (supply with water, as with channels or ditches or streams):

irrigate