instancy vs quickness

instancy and quickness both are nouns.

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

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

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

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