Dentist: a person whose job is treating people's teeth.
Noun / I couldn't see my regular dentist
Electrician: a person who puts in, checks, and repairs electrical wires and electrical equipment.
Noun / For the past year, he has worked as an electrician at a plant in Manchester.
Emergency medical technician: a person who is trained to do medical work in an emergency, but who is not a doctor or nurse.
Noun / Emergency medical technicians (EMTs) arrived four minutes after the 911 call.