investigator [investigators]◼◼◼(one who investigates) noun [UK: ɪn.ˈve.stɪ.ɡeɪ.tə(r)] [US: ˌɪn.ˈve.stə.ˌɡe.tər]John is our best investigator. = John est notre meilleur enquêteur.
detective [detectives]◼◼◻(person employed to find information) noun [UK: dɪ.ˈtek.tɪv] [US: də.ˈtek.tɪv]John Jackson is one of the best detectives in Boston. = John Jackson est un des meilleurs enquêteurs de Boston.
pollster [pollsters]◼◻◻(person who conducts polls) noun [UK: ˈpəʊl.stə(r)] [US: ˈpoʊl.stə(r)]