republish vs republication

republish is not a noun while republication is a noun.

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

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

republish (verb)	republication (verb)
revive (a cancelled will or a libel)
publish again