instantaneousness vs quickness

instantaneousness and quickness both are nouns.

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

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

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

instantaneousness (noun)	quickness (noun)
the quickness of action or occurrence	a rate that is rapid
	intelligence as revealed by an ability to give correct responses without delay
	skillful performance or ability without difficulty