write vs knock off

write and knock off both are verbs.

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

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

write (verb)	knock off (verb)
communicate or express by writing	stop pursuing or acting
record data on a computer	get rid of (someone who may be a threat) by killing
contact in writing	write quickly
produce a literary work	take by theft
mark or trace words or symbols on a surface	cut the price of
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