enabler [enablers](one who helps something to happen) noun [UK: e.ˈneɪ.bə.lə(r)] [US: e.ˈneɪ.bə.lər]
facilitator [facilitators](person who helps a group to have an effective dialog without taking any side of the argument) noun [UK: fə.ˈsɪ.lɪ.teɪ.tə(r)] [US: fə.ˈsɪ.lə.ˌte.tər]