headwater vs origin

headwater and origin both are nouns.

Word	Noun	Adjective	Verb	Adverb
headwater	Yes	No	No	No
origin	Yes	No	No	No

As nouns, origin is a hypernym of headwater; that is, origin is a word with a broader meaning than headwater:

Other hypernyms of headwater include beginning, root, rootage, source.

headwater (noun)	origin (noun)
the source of a river	properties attributable to your ancestry
	the point of intersection of coordinate axes; where the values of the coordinates are all zero
	an event that is a beginning; a first part or stage of subsequent events
	the hereditary derivation of an individual
	the place where something begins, where it springs into being
	the source of something's existence or from which it derives or is derived