Depends on what kind of service they provide. Examples could be waiter, waitress, caterer.
'Counselor' is one term, particularly a "guidance counselor." Caseworker is another.
Another name for a roof worker is roofer.
HAT IS ANOTHER NAME FOR NATIONAL SOCIALIST GERMAN WORKER and PARTY?
They are sometimes referred to as a social welfare worker.
Blacksmith
artisan
paramedics
Jill.
barker
employee, hireling, jobholder
a hard worker
Baseball Player Construstion Worker Fast Food Worker Trucker