rootage vs root system

rootage and root system both are nouns.

Word	Noun	Adjective	Verb	Adverb
rootage	Yes	No	No	No
root system	Yes	No	No	No

As nouns, rootage and root system are synonyms defined as:

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