Word Study
headwater
CIDE DICTIONARY
headwater, n.
The source and upper part of a stream; -- commonly used in the plural; as, the headwaters of the Missouri. [Webster 1913 Suppl.]
THESAURUS
headwater
font, fount, fountain, fountainhead, head, headspring, headstream, headwaters, mainspring, mine, quarry, riverhead, source, spring, springhead, well, wellhead, wellspringFor further exploring for "headwater" in Webster Dictionary Online