Bout and Grand mal

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

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

Grand mal noun - Epilepsy in which the attacks involve loss of consciousness and tonic spasms of the musculature followed by generalized jerking.

Bout and grand mal are semantically related. Sometimes you can use "Bout" instead a noun phrase "Grand mal".