They are different terms for the same thing. They are electro-magnetic fields (EMF) that can be detrimental to human well-being. Sources include transformers, heating elements, mains transformers, substations, pylons, railway tracks, microwave emitting mobile phone masts, wires carrying alternating current, heated blankets, motorised beds and computers etc.. If a person is exposed to some sources in a close enough proximity for prolonged periods then well-being can be adversely affected.