This is the 7982nd most frequent Polish word.
nadkomisarz
Senior commissioner.
In this sentence, "nadkomisarz" refers to a senior police officer who successfully handled an important investigation. It demonstrates the use of the term as a professional title.
Nadkomisarz Kowalski rozwiązał skomplikowaną sprawę kryminalną.
Superintendent Kowalski solved a complex criminal case.
Here, "nadkomisarz" is used as a noun to signify the role of the individual entering the office, specifically a senior law enforcement officer.
Do biura wszedł nadkomisarz, witając się serdecznie z pracownikami.
The superintendent entered the office, greeting the staff warmly.
In this instance, "nadkomisarzem" is in the instrumental case, describing engagement with an individual holding the rank of superintendent.