* Abstract nouns represent ideas, concepts, qualities, or states of being. They cannot be physically touched or seen.
* Concrete nouns represent physical things that can be touched, seen, heard, smelled, or tasted.
While crimes have tangible effects (like stolen property), the concept of "crime" itself is an abstract idea. It's not a physical thing you can hold or experience directly.
Here's an example:
* Concrete: The thief stole a wallet. (Wallet is a physical object)
* Abstract: The thief committed a crime. (Crime is an abstract concept)