repeal vs revocation

repeal and revocation both are nouns.

Word	Noun	Adjective	Verb	Adverb
repeal	Yes	No	Yes	No
revocation	Yes	No	No	No

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

repeal: the act of abrogating; an official or legal cancellation
revocation: the act (by someone having the authority) of annulling something previously done

Other hyponyms of repeal include derogation, vacation, recall.

repeal (noun)	revocation (noun)
the act of abrogating; an official or legal cancellation	the act (by someone having the authority) of annulling something previously done
	the state of being cancelled or annulled

repeal (verb)	revocation (verb)
cancel officially