The difference between Gradual and Sudden
When used as nouns, gradual means an antiphon or responsory after the epistle, in the mass, which was sung on the steps, or while the deacon ascended the steps, whereas sudden means an unexpected occurrence.
When used as adjectives, gradual means proceeding or advancing by small, slow, regular steps or degrees, whereas sudden means happening quickly and with little or no warning.
Sudden is also adverb with the meaning: suddenly.
check bellow for the other definitions of Gradual and Sudden
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Gradual as an adjective:
Proceeding or advancing by small, slow, regular steps or degrees
Examples:
"a gradual increase of knowledge; a gradual decline"
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Gradual as a noun (Christianity):
An antiphon or responsory after the epistle, in the Mass, which was sung on the steps, or while the deacon ascended the steps.
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Gradual as a noun (Christianity):
A service book containing the musical portions of the Mass.
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Sudden as an adjective:
Happening quickly and with little or no warning.
Examples:
"The sudden drop in temperature left everyone cold and confused."
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Sudden as an adjective (obsolete):
Hastily prepared or employed; quick; rapid.
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Sudden as an adjective (obsolete):
Hasty; violent; rash; precipitate.
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Sudden as an adverb (poetic):
Suddenly.
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Sudden as a noun (obsolete):
An unexpected occurrence; a surprise.