importunateness vs instancy

importunateness and instancy both are nouns.

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

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

importunateness: Quality of a person who is given to making importunate demands, being greedily or thoughtlessly demanding.
instancy: the quality of being insistent

Other hypernyms of importunateness include imperativeness.

importunateness (noun)	instancy (noun)
Quality of a person who is given to making importunate demands, being greedily or thoughtlessly demanding.	the quality of being insistent
	the quickness of action or occurrence