drop off vs set down

drop off and set down both are verbs.

Word	Noun	Adjective	Verb	Adverb
drop off	No	No	Yes	No
set down	No	No	Yes	No

As verbs, drop off and set down are synonyms defined as:

Other synonyms of drop off include discharge, drop, put down, unload.

drop off (verb)	set down (verb)
change from a waking to a sleeping state	put down in writing; of texts, musical compositions, etc.
fall to a lower standard	remove (cargo, people, etc.) from and leave
fall or diminish	put or settle into a position
retreat	cause to sit or seat or be in a settled position or place
remove (cargo, people, etc.) from and leave	go ashore
	reach or come to rest