republication vs publishing

republication and publishing both are nouns.

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

As nouns, publishing is a hypernym of republication; that is, publishing is a word with a broader meaning than republication:

Other hypernyms of republication include publication.

republication (noun)	publishing (noun)
the act of publishing again	the business of issuing printed matter for sale or distribution
something that has been published again; a fresh publication (as of a literary work)