An opzichter is an overseer.
If you find that your ancestor was an opzichter, that can be a clue to find more records about him. Opzichters were hired by various organizations like hospitals or prisons. In former Dutch colonies, you can find overseers on plantations or managing enslaved people. The organizations the overseers worked for may have created records that shed more life on your ancestors’ lives, or for the people they oversaw.
If you are looking at a death record and the informants are opzichters, that could be a clue that your ancestor died in an institution like a hospital, prison, or asylum. Finding out where the informants worked could help you learn more about the circumstances of your ancestor’s death.
See Record analysis example – Dutch death record for an example where the informant was a big clue.