republishing vs republication

republishing and republication both are nouns.

Word	Noun	Adjective	Verb	Adverb
republishing	Yes	No	No	No
republication	Yes	No	No	No

As nouns, republishing and republication are synonyms defined as:

republishing (noun)	republication (noun)
the act of publishing again	the act of publishing again
	something that has been published again; a fresh publication (as of a literary work)