Bout and Single combat

Bout noun - A competitive encounter between individuals or groups carried on for amusement, exercise, or in pursuit of a prize.

Single combat and bout are semantically related In some cases you can use "Single combat" instead a noun "Bout".

Single combat noun - A fight between two people.

Bout and single combat are semantically related in fight topic. You can use "Bout" instead a noun phrase "Single combat".