'Duchess' is feminine of-

The term "Duchess" is the feminine counterpart of "Duke." Here's the reason why the others are not correct:

1. Dramatist: A dramatist is a person who writes plays or dramas, and it is a gender-neutral term. There isn't a distinct feminine form of "dramatist" because it is not tied to a specific title or nobility like "Duke" or "Duchess."
2. Dutchman: "Dutchman" is a term used to refer to a man from the Netherlands. It doesn't have a feminine form because it's a nationality or regional identifier and is not related to nobility or gender-specific titles.
3. Earl: "Earl" is a noble title, and the feminine equivalent of an Earl is a "Countess," not a Duchess. In some countries, such as the United Kingdom, an Earl is often a title within the peerage (অভিজাত সম্প্রদায়), and his wife would be referred to as a Countess, not a Duchess.

So, to reiterate, "Duchess" is the feminine form of "Duke," and the others are not correct because they are not titles of nobility or gender-specific counterparts in the same way that "Duchess" is to "Duke."