Is "effect" a noun?
Yes. "Effect" is almost always a noun — the result of something: the effect was immediate.
A little morei
Most of the time, effect is what you see after an action — the outcome, the consequence. There is a rare verb use meaning "to bring about" ("to effect change"), but it is formal and easily confused. In everyday prose, trust the noun: cause and effect go together.
The full entryii
Confusables
Affect vs. Effect
The action versus the result — a verb and a noun most of the time.
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