depreciation vs step-down

depreciation and step-down both are nouns.

Word	Noun	Adjective	Verb	Adverb
depreciation	Yes	No	No	No
step-down	Yes	No	No	No

As nouns, step-down is a hypernym of depreciation; that is, step-down is a word with a broader meaning than depreciation:

Other hypernyms of depreciation include decrease, diminution, reduction.

depreciation (noun)	step-down (noun)
a decrease in price or value	the act of decreasing or reducing something
a communication that belittles somebody or something
decrease in value of an asset due to obsolescence or use