Clod and Dork

Clod noun - A big clumsy often slow-witted person.

Dork and clod are semantically related In some cases you can use "Dork" instead a noun "Clod". slang substitute

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

Clod and dork are semantically related in dullard topic. Sometimes you can use "Clod" instead a noun "Dork", if it concerns topics such as boor, stupid person.