Tug-of-war and Zapper

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

Zapper and tug-of-war are semantically related. In some cases you can use "Zapper" instead a noun phrase "Tug-of-war".

Zapper noun - An electrical device that can injure or kill by means of electric currents.

Tug-of-war and zapper are semantically related. Sometimes you can use "Tug-of-war" instead a noun "Zapper".