Synonyms for Cancellation:

n.

assignment, assign, alienate, bail, attest, blind trust, cancel, include, expunction, alienation, cause. single, return, avoidance, stub, sold-out, on the door, ticket, open ticket, Ticketing, continue, Defeasance. annulment (noun)
disavowal, revocation, deletion, elimination, undoing, dissolution, nullification, denial, eradication, annulment, neutralization, invalidation, negation, repudiation, Extinguishment, abolition, Disclamation, Disaffirmation, retraction, abnegation, obliteration, destruction, refutation, divorce, withdrawal, abolishment.
calling off; erasure (noun)
elimination, repudiation, undoing, annulment, recall, abandonment, retirement, repeal, invalidation, dissolving, invalidating, dissolution, recalling, revocation, Abolishing, deletion, abolition, Retracting, abrogation, retraction, reversal, withdrawing, Revoking, Overruling, Abandoning, nullification, Reversing.
cancellation (noun)
neutralization, invalidation, annulment, abolition, revocation, Abandoning, deletion, elimination, abandonment, repeal.
denial (noun)
repudiation.
expunction (noun)
expunction.
negation (noun)
counterbalancing, inversion, nonacceptance, contradiction, Overturning.
obliteration (noun)
annihilation, expurgation, censorship, erasure.
receipt (noun)
stub.
renunciation (noun)
renouncement.
riddance (noun)
desertion, release, dismissal, disposal, relinquishment, renouncement, surrender, capitulation, rejection, relegation, abandonment, riddance, abdication.
turnaround (noun)
inversion.

Other synonyms:

bail, sold-out, assignment, expunction, voidance, assign, Ticketing, open ticket, blind trust, cancel, abrogation, Defeasance. alienation, attest. avoidance, stub, alienate. cause. ticket. single. return. abrogation
repeal.
repudiation
reversal.
Other relevant words:
expunction, recalling, end, voidance, Retracting, reversal, sold-out, stub, assignment, Reversing, voiding, Overruling, repeal, recall, alienate, return, Defeasance, withdrawing, abrogation, cancel, Rescinding, invalidating, avoidance, single, Abolishing, Annulling, dissolving, bail, Abandoning, retirement, Revoking.