interest rate vs rate

interest rate and rate both are nouns.

Word	Noun	Adjective	Verb	Adverb
interest rate	Yes	No	No	No
rate	Yes	No	Yes	No

As nouns, rate is a hypernym of interest rate; that is, rate is a word with a broader meaning than interest rate:

Other hypernyms of interest rate include charge per unit.

interest rate (noun)	rate (noun)
the percentage of a sum of money charged for its use	the relative speed of progress or change
	amount of a charge or payment relative to some basis
	a quantity or amount or measure considered as a proportion of another quantity or amount or measure
	a magnitude or frequency relative to a time unit

interest rate (verb)	rate (verb)
	assign a rank or rating to
	estimate the value of
	be worthy of or have a certain rating