This is the 6014th most frequent Polish word.
żużla
"Żużla" is the genitive singular or nominative plural form of "żużel," which means slag (a byproduct of metal smelting) or speedway (motorcycle sport) in Polish, depending on context.
In this context, 'żużla' refers to the sport of speedway motorcycle racing.
Na stadionie odbywa się mecz żużla.
At the stadium, a speedway match is taking place.
Here, 'żużla' is used to describe the residue or slag left after burning.
Palenisko było pełne żużla po zakończeniu ogniska.
The fire pit was full of slag after the bonfire ended.
In this sentence, 'żużla' illustrates the physical substance, slag, formed from melted material.