fixedness vs rootage

fixedness and rootage both are nouns.

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

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

fixedness (noun)	rootage (noun)
the quality of being fixed in place as by some firm attachment	the place where something begins, where it springs into being
the quality of being fixed and unchangeable	a developed system of roots
remaining in place	fixedness by or as if by roots