air-drop vs drop off

air-drop and drop off both are verbs.

Word	Noun	Adjective	Verb	Adverb
air-drop	No	No	Yes	No
drop off	No	No	Yes	No

As verbs, drop off is a hypernym of air-drop; that is, drop off is a word with a broader meaning than air-drop:

Other hypernyms of air-drop include discharge, drop, put down, set down, unload.

air-drop (verb)	drop off (verb)
drop (an object) from the air; unload from a plane or helicopter	change from a waking to a sleeping state
	fall to a lower standard
	fall or diminish
	retreat
	remove (cargo, people, etc.) from and leave