importunity vs imperativeness

importunity and imperativeness both are nouns.

Word	Noun	Adjective	Verb	Adverb
importunity	Yes	No	No	No
imperativeness	Yes	No	No	No

As nouns, imperativeness is a hypernym of importunity; that is, imperativeness is a word with a broader meaning than importunity:

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

Other hypernyms of importunity include instancy.

importunity (noun)	imperativeness (noun)
Quality of a person who is given to making importunate demands, being greedily or thoughtlessly demanding.	the quality of being insistent
insistent solicitation and entreaty	the state of demanding notice or attention