rate of depreciation vs depreciation rate

rate of depreciation and depreciation rate both are nouns.

Word	Noun	Adjective	Verb	Adverb
rate of depreciation	Yes	No	No	No
depreciation rate	Yes	No	No	No

As nouns, rate of depreciation and depreciation rate are synonyms defined as:

rate of depreciation and depreciation rate: the rate at which the value of property is reduced; used to calculate tax deduction

rate of depreciation (noun)	depreciation rate (noun)
the rate at which the value of property is reduced; used to calculate tax deduction	the rate at which the value of property is reduced; used to calculate tax deduction