conductor
/kənˈdʌktər/ noun [C]
MUSIC › someone who stands in front of a group of musicians or singers and controls their performance
BUS UK › someone whose job is to sell or check tickets on a bus, train, etc
TRAIN US (UK guard) › someone whose job is to be responsible for a train and the people who work on it
HEAT › a substance that allows electricity or heat to go through it