This is the 10416th most frequent Polish word.
czarnoprochowa
"Black-powder" (referring to firearms or materials using black powder).
The word "czarnoprochowa" is an adjective describing the type of weapon (firearm) with a black powder mechanism, indicating its historical usage.
Czarnoprochowa broń była używana w dawnych czasach.
Black powder firearms were used in ancient times.
Here "czarnoprochowych" is a descriptive adjective modifying "pistoletów" (pistols), emphasizing their black powder nature.
Muzeum posiada kolekcję czarnoprochowych pistoletów.
The museum holds a collection of black powder pistols.
In this case, "czarnoprochowej" is used as an adjective to detail the type of firearms featured in the demonstrations.