drop-off vs formation

drop-off and formation both are nouns.

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

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

Other hypernyms of drop-off include geological formation.

drop-off (noun)	formation (noun)
a change downward	the act of fabricating something in a particular shape
a steep high face of rock	the act of forming or establishing something
a noticeable deterioration in performance or quality	creation by mental activity
	a particular spatial arrangement
	an arrangement of people or things acting as a unit
	(geology) the geological features of the earth
	natural process that causes something to form