Nerd and Softhead

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

Softhead and nerd are semantically related in ability topic. In some cases you can use "Softhead" instead a noun "Nerd".

Softhead noun - A silly flighty person.

Nerd and softhead are semantically related in ability topic. Sometimes you can use "Nerd" instead a noun "Softhead", if it concerns topics such as fool.