Bout and Tug-of-war

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

Tug-of-war and bout are semantically related In some cases you can use "Tug-of-war" instead a noun "Bout".

Tug-of-war noun - An earnest effort for superiority or victory over another.

Bout and tug-of-war are semantically related in contest topic. Sometimes you can use "Bout" instead a noun phrase "Tug-of-war", if it concerns topics such as competition.