Headwaters
Upper course and headwaters are semantically related. In some cases you can use "Upper course" instead a noun "Headwaters".
Upper course
Headwaters and upper course are semantically related. You can use "Headwaters" instead a noun "Upper course".
Mutual synonyms
Cite this Source
Upper course and Headwaters. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/headwaters/upper_course
Headwaters & Upper course. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/headwaters/upper_course>.
Upper course or Headwaters. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/headwaters/upper_course.
Google Ngram Viewer shows how "headwaters" and "upper course" have occurred on timeline