assessor

noun | \ ə-ˈse-sər \ | as·ses·sor

1. : one appointed or elected to assist a judge or magistrate; especially : one with special knowledge of the subject to be decided — see also master : one with special knowledge of the subject to be decided — see also master

2. : one that assesses; specifically : one that is authorized to assess property for taxation : one that is authorized to assess property for taxation