Proper noun:
* Bell as a specific name: Think of the "Liberty Bell," or a person named "Bell." In these cases, it's a unique identifier and capitalized.
Common noun:
* Bell as a general object: This refers to any bell, like a doorbell, a school bell, or a church bell. It's not a specific name and is lowercase.
Example:
* Proper noun: "The Liberty Bell is a symbol of American freedom."
* Common noun: "The bell rang, signaling the end of class."
So, it's important to look at the context to determine if "bell" is being used as a proper noun or a common noun.