centralization vs gathering

centralization and gathering both are nouns.

Word	Noun	Adjective	Verb	Adverb
centralization	Yes	No	No	No
gathering	Yes	No	No	No

As nouns, gathering is a hypernym of centralization; that is, gathering is a word with a broader meaning than centralization:

Other hypernyms of centralization include gather.

centralization (noun)	gathering (noun)
the act of consolidating power under a central control	the social act of assembling
gathering to a center	the act of gathering something
	sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching
	a group of persons together in one place