wood is an electrical / electrical matter insulator
insulated_wire is electrical_wire. electrical_insulator is insulating_medium. insulated_wire is not electrical_wire. spark_plug_wire is insulated_wire. power_cord is multi_conductor_insulated_wire. building_wire is insulated_wire. electrical_wire is electrical_conductor. electrical_insulator is not insulating_medium. electrical_plug is electrical_conductor. electrical_plug is not electrical_conductor.