headspring vs rootage

headspring and rootage both are nouns.

Word	Noun	Adjective	Verb	Adverb
headspring	Yes	No	No	No
rootage	Yes	No	No	No

As nouns, rootage is a hypernym of headspring; that is, rootage is a word with a broader meaning than headspring:

Other hypernyms of headspring include beginning, origin, root, source.

headspring (noun)	rootage (noun)
the source of water from which a stream arises	the place where something begins, where it springs into being
	a developed system of roots
	fixedness by or as if by roots