Prelim and Rough-and-tumble

Prelim noun - A minor match preceding the main event.

Rough-and-tumble and prelim are semantically related. In some cases you can use "Rough-and-tumble" instead a noun "Prelim".

Rough-and-tumble noun - A rough and often noisy fight usually involving several people.

Prelim and rough-and-tumble are semantically related. Sometimes you can use "Prelim" instead a noun phrase "Rough-and-tumble".