Is a proper or common noun?

"Proper" can be both a common noun and a proper noun, depending on how it's used.

* Common Noun: When referring to the general concept of something being "correct" or "suitable," it's a common noun.

* Example: "The teacher emphasized the importance of proper grammar."

* Proper Noun: When referring to a specific person, place, or thing with a unique name, it becomes a proper noun. This is less common, but can occur in some contexts.

* Example: "There's a bakery called 'The Proper Pie Shop' on Main Street."

Let me know if you have any other words you'd like to analyze!