Here's why:
* Abstract nouns refer to concepts, qualities, or ideas that cannot be touched or physically experienced. "Effect" represents the result or consequence of something, which is a concept or idea rather than a tangible object.
* You can't physically hold or touch an "effect." It's a result that exists in our minds or observations.
Examples:
* The effect of the medicine was immediate.
* The effect of the storm was devastating.
Let me know if you have other words you'd like to check!