promptitude vs quickness

promptitude and quickness both are nouns.

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

As nouns, quickness is a hypernym of promptitude; that is, quickness is a word with a broader meaning than promptitude:

Other hypernyms of promptitude include celerity, rapidity, rapidness, speediness.

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