trail head vs rootage

trail head and rootage both are nouns.

Word	Noun	Adjective	Verb	Adverb
trail head	Yes	No	No	No
rootage	Yes	No	No	No

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

Other hypernyms of trail head include beginning, origin, root, source.

trail head (noun)	rootage (noun)
the beginning of a trail	the place where something begins, where it springs into being
	a developed system of roots
	fixedness by or as if by roots