revision vs rewriting

revision and rewriting both are nouns.

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

As nouns, rewriting is a hypernym of revision; that is, rewriting is a word with a broader meaning than revision:

Other hypernyms of revision include revising.

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