rate vs swiftness

rate and swiftness both are nouns.

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

As nouns, swiftness is a hyponym of rate; that is, swiftness is a word with a more specific, narrower meaning than rate:

rate (noun)	swiftness (noun)
the relative speed of progress or change	a rate (usually rapid) at which something happens
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

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