Here's why:
* Eleanor Roosevelt was a specific individual: She was a unique person with her own name.
* Common nouns are general: They refer to a class of things, not an individual. Examples include "woman," "politician," "activist," "first lady."
However, you could use common nouns to describe her roles:
* First Lady: She was the First Lady of the United States.
* Diplomat: She served as a delegate to the United Nations.
* Humanitarian: She was known for her work with human rights and social justice.
* Writer: She was a prolific author.
So, while there isn't a single common noun for Eleanor Roosevelt, you can use various common nouns to describe her different roles and accomplishments.