write-off vs cancellation

write-off and cancellation both are nouns.

Word	Noun	Adjective	Verb	Adverb
write-off	Yes	No	No	No
cancellation	Yes	No	No	No

As nouns, cancellation is a hypernym of write-off; that is, cancellation is a word with a broader meaning than write-off:

write-off: the act of cancelling from an account a bad debt or a worthless asset
cancellation: the act of cancelling; calling off some arrangement

write-off (noun)	cancellation (noun)
the act of cancelling from an account a bad debt or a worthless asset	the act of cancelling; calling off some arrangement
(accounting) reduction in the book value of an asset	the speech act of revoking or annulling or making void