imperative vs imperativeness

imperative and imperativeness both are nouns.

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

imperative (noun)	imperativeness (noun)
some duty that is essential and urgent	the quality of being insistent
a verb in the imperative mood.	the state of demanding notice or attention
a mood that expresses an intention to influence the listener's behavior

imperative (adjective)	imperativeness (adjective)
requiring attention or action
relating to verbs in the imperative mood