Conductor is a noun with multiple meanings:
1. A person who directs the performance of an orchestra or choir.
2. A material or device that conducts or transmits heat, electricity, or sound.
3. A person who collects fares on a public conveyance (bus, train, etc.).
4. In physics, a substance that allows the flow of electrical current or thermal energy.
5. In railway systems, a person in charge of a train.