origin vs headwater

origin and headwater both are nouns.

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

As nouns, headwater is a hyponym of origin; that is, headwater is a word with a more specific, narrower meaning than origin:

origin (noun)	headwater (noun)
properties attributable to your ancestry	the source of a river
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