contractor [contractors](A person or company that performs specific tasks like electrical or plumbing work in construction projects) noun [UK: ˈkɒn.træk.tə(r)] [US: ˈkɑːn.ˌtræk.tər]
subcontractor [subcontractors](contractor hired by contractor) noun [UK: ˌsʌbk.ən.ˈtræk.tə(r)] [US: səbˈk.ɑːn.ˌtræk.tər]