This is the 744th most frequent Croatian word.
kaznenog
"Kaznenog" means "penal" or "criminal" in English.
In this sentence, 'kaznenog' qualifies 'prava' (law), indicating its association with crimes and legal penalties.
Studirao je specifičnosti kaznenog prava.
He studied the specifics of criminal law.
The word 'kaznenog' is used as an adjective, describing 'zatvora' (prison), and it means 'penal' in this context, relating to punishment and the justice system.
Napokon je pušten iz kaznenog zatvora.
He was finally released from the penal prison.
Here, 'kaznenog' modifies 'inspektora' (inspectors), implying their role is related to the investigation and handling of crimes.