worker, aluminium, engineer, metal, scrap, warehouse, business, caucasian, construction, control, craftsman tool, decorative, drill, ecology, energy, engineering, environment, equipment, factory, heap, helmet, hole, industrial, industry, iron, job, lathe, machine, machinery, male, manager, manufacturing, mechanic, occupation, people, pile, production, professional, protective, rubbish, safety, sparkle, stack, stainless, steel, technician, technique, technology, tool, workshop
