Here's why you can't have a proper noun for "lady":
* "Lady" is a common noun: It's a general term for a woman, like "man" or "child."
* Proper nouns are unique: They refer to one specific person, like "Mary" or "Susan."
* You could use a title: "Lady" can be used as a title, like "Lady Gaga" or "Lady Macbeth." However, these are titles specific to those individuals, not a general term for "lady."
Examples of proper nouns for women:
* Names: Jane, Emily, Sophia, etc.
* Titles: Queen Elizabeth, Countess of York, Madame Curie, etc.
Let me know if you have any other questions!