unload vs drop off

unload and drop off both are verbs.

Word	Noun	Adjective	Verb	Adverb
unload	No	No	Yes	No
drop off	No	No	Yes	No

As verbs, unload and drop off are synonyms defined as:

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

unload (verb)	drop off (verb)
remove the load from (a container or vehicle)	change from a waking to a sleeping state
remove (cargo, people, etc.) from and leave	fall to a lower standard
	fall or diminish
	retreat
	remove (cargo, people, etc.) from and leave