instancy vs celerity

instancy and celerity both are nouns.

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

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

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

instancy (noun)	celerity (noun)
the quality of being insistent	a rate that is rapid
the quickness of action or occurrence