imperative vs verb

imperative and verb both are nouns.

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

As nouns, verb is a hypernym of imperative; that is, verb is a word with a broader meaning than imperative:

imperative: a verb in the imperative mood.
verb: a content word that denotes an action, occurrence, or state of existence

imperative (noun)	verb (noun)
some duty that is essential and urgent	a content word that denotes an action, occurrence, or state of existence
a verb in the imperative mood.	the word class that serves as the predicate of a sentence
a mood that expresses an intention to influence the listener's behavior

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