write vs write off

write and write off both are verbs.

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

As verbs, write off is a hyponym of write; that is, write off is a word with a more specific, narrower meaning than write:

write (verb)	write off (verb)
communicate or express by writing	reduce the estimated value of something
record data on a computer	concede the loss or worthlessness of something or somebody
contact in writing	write something fluently, and without hesitation
produce a literary work	cancel (a debt)
mark or trace words or symbols on a surface
write or name the letters that comprise the conventionally accepted form of (a word or part of a word)
write music
create code, write a computer program