What is an antonym for the noun bard?

There isn't a direct antonym for "bard" in the sense of a poet, specifically. However, depending on the context, you could use several words that convey an opposite meaning:

* Prosaist: Someone who writes in prose, as opposed to poetry.

* Non-poet: This is a direct opposite, but not as elegant.

* Musician: If you are focusing on the musical aspect of a bard's work, this could be an opposite.

* Critic: Someone who analyzes and judges art, in contrast to creating it.

* Ignorant: This is a more figurative opposite, suggesting someone who doesn't appreciate or understand poetry.

Ultimately, the best antonym depends on the specific situation and the intended meaning.