quickness vs promptness

quickness and promptness both are nouns.

Word	Noun	Adjective	Verb	Adverb
quickness	Yes	No	No	No
promptness	Yes	No	No	No

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

quickness (noun)	promptness (noun)
a rate that is rapid	the characteristic of doing things without delay
intelligence as revealed by an ability to give correct responses without delay	the quality or habit of adhering to an appointed time
skillful performance or ability without difficulty