revising vs revision

revising and revision both are nouns.

Word	Noun	Adjective	Verb	Adverb
revising	Yes	No	No	No
revision	Yes	No	No	No

As nouns, revision is a hyponym of revising; that is, revision is a word with a more specific, narrower meaning than revising:

Other hyponyms of revising include rescript, revisal, revise, recasting, rephrasing, rewording.

revising (noun)	revision (noun)
editing that involves writing something again	the act of revising or altering (involving reconsideration and modification)
	something that has been written again
	the act of rewriting something