write off vs pen

write off is not a noun while pen is a noun.

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

As verbs, pen is a hypernym of write off; that is, pen is a word with a broader meaning than write off:

Other hypernyms of write off include compose, indite, write.

write off (noun)	pen (noun)
	female swan
	a writing implement with a point from which ink flows
	an enclosure for confining livestock
	a correctional institution for those convicted of major crimes
	a portable enclosure in which babies may be left to play

write off (verb)	pen (verb)
reduce the estimated value of something	produce a literary work
concede the loss or worthlessness of something or somebody
write something fluently, and without hesitation
cancel (a debt)