Nerd and Simpleton

Nerd noun - A person slavishly devoted to intellectual or academic pursuits.

Simpleton and nerd are semantically related in ability topic. In some cases you can use "Simpleton" instead a noun "Nerd", when it comes to topics like fool.

Simpleton noun - A person who lacks good sense or judgment.

Nerd and simpleton are semantically related in ability topic. You can use "Nerd" instead a noun "Simpleton".