The difference between Imperative and Interrogative
When used as nouns, imperative means the grammatical mood expressing an order (see jussive). in english, the imperative form of a verb is the same as that of the bare infinitive, whereas interrogative means a word (pronoun, pronominal adjective, or adverb) implying interrogation, or used for asking a question: why, who, when, etc.
When used as adjectives, imperative means essential, whereas interrogative means asking or denoting a question: as, an interrogative phrase, pronoun, or point.
check bellow for the other definitions of Imperative and Interrogative
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Imperative as an adjective:
Essential; crucial; extremely important.
Examples:
"It is imperative that you come here right now."
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Imperative as an adjective (grammar):
Of, or relating to the imperative mood.
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Imperative as an adjective (computing theory):
Having a semantics that incorporates mutable variables.
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Imperative as an adjective:
Expressing a command; authoritatively or absolutely directive.
Examples:
"'imperative orders"
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Imperative as a noun (uncountable, grammar):
The grammatical mood expressing an order (see jussive). In English, the imperative form of a verb is the same as that of the bare infinitive.
Examples:
"The verbs in sentences like "Do it!" and "Say what you like!" are in the imperative."
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Imperative as a noun (countable, grammar):
A verb in imperative mood.
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Imperative as a noun (countable):
An essential action, a must: something which is imperative.
Examples:
"Visiting Berlin is an imperative."
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Interrogative as an adjective (grammar):
Asking or denoting a question: as, an interrogative phrase, pronoun, or point.
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Interrogative as an adjective:
Pertaining to inquiry; questioning
Examples:
"usex He took on an interrogative tone of voice."
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Interrogative as a noun (grammar):
A word (pronoun, pronominal adjective, or adverb) implying interrogation, or used for asking a question: why, who, when, etc.
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Interrogative as a noun (typography, archaic):
⟨?⟩.
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Interrogative as a noun (rare):
A question; an interrogation.