depreciation rate vs rate of depreciation

depreciation rate and rate of depreciation both are nouns.

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

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

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

depreciation rate (noun)	rate of depreciation (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