It used to be Flight Information, then Radar Information, then Radar advisory service.
Traffic service = old Radar Information service
Deconfliction = between old RIS and RAS
Procedural = old radar advisory service
In real terms if you are outside controlled airspace, any service is subject to workload. Often if you request a traffic service, the response is "reduced traffic service due to poor radar performance" which sounds like a complete arse covering tactic on the controllers part.