repayment rate vs payment rate

repayment rate and payment rate both are nouns.

Word	Noun	Adjective	Verb	Adverb
repayment rate	Yes	No	No	No
payment rate	Yes	No	No	No

As nouns, repayment rate and payment rate are synonyms defined as:

repayment rate and payment rate: the amount of money paid out per unit time

Other synonyms of repayment rate include installment rate, rate of payment.

repayment rate (noun)	payment rate (noun)
the amount of money paid out per unit time	the amount of money paid out per unit time