1.  revocation(n = noun.state) annulment - the state of being cancelled or annulled;
is a kind of state

2.  revocation(n = noun.act) - the act (by someone having the authority) of annulling something previously done; "the revocation of a law"
is a kind of abrogation, annulment, repeal
Derived form verb revoke₂

1.  The act of calling back, or the state of being recalled; recall. [1913 Webster]
"One that saw the people bent for the revocation of Calvin, gave him notice of their affection." [1913 Webster]

2.  The act by which one, having the right, annuls an act done, a power or authority given, or a license, gift, or benefit conferred; repeal; reversal; as, the revocation of an edict, a power, a will, or a license. [1913 Webster]

N  tergiversation, change of mind, change of intention, change of purpose, afterthought, tergiversation, recantation, palinode, palinody, renunciation, abjuration, abjurement, defection, going over, apostasy, retraction, retractation, withdrawal, disavowal, revocation, revokement, reversal, repentance, redintegratio amoris, coquetry, vacillation, backsliding, volte-face, turn coat, turn tippet, rat, apostate, renegade, convert, pervert, proselyte, deserter, backslider, blackleg, crawfish, scab, mugwump, recidivist, time server, time pleaser, timist, Vicar of Bray, trimmer, ambidexter, weathercock, Janus, changeful, irresolute, ductile, slippery as an eel, trimming, ambidextrous, timeserving, coquetting, revocatory, reactionary, a change came o'er the spirit of my dream.

N  abrogation, annulment, nullification, recision, vacatur, canceling, cancel, revocation, revokement, repeal, rescission, defeasance, dismissal, conge, demission, bounce, deposal, deposition, dethronement, disestablishment, disendowment, deconsecration, sack, walking papers, pink slip, walking ticket, yellow cover, abolition, abolishment, dissolution, counter order, countermand, repudiation, retraction, retractation, recantation, abolitionist, abrogated, functus officio, Int, get along with you!, begone!, go about your business!, away with!.

N  refusal, rejection, noncompliance, incompliance, denial, declining, declension, declinature, peremptory refusal, flat refusal, point blank refusal, repulse, rebuff, discountenance, recusancy, abnegation, protest, disclaimer, dissent, revocation, refusing, restive, restiff, recusant, uncomplying, unconsenting, not willing to hear of, deaf to, refused, ungranted, out of the question, not to be thought of, impossible, no, on no account, not for the world, no thank you, thanks but no thanks, non possumus, your humble servant, bien oblige, not on your life, no way, not even if you beg on your knees.