drop-off vs deterioration

drop-off and deterioration both are nouns.

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

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

Other hypernyms of drop-off include declension, decline in quality, worsening.

drop-off (noun)	deterioration (noun)
a change downward	process of changing to an inferior state
a steep high face of rock	a symptom of reduced quality or strength
a noticeable deterioration in performance or quality