Plumbers

noun

1. One who works in or with lead.
2. One who furnishes, fits, and repairs pipes and other apparatus for the conveyance of water, gas, or drainage.
3. A person who investigates or prevents leaks of information
4. In the Royal Navy, an apprentice, a boy aged 16 to 18, who is trained in technical skills at the Dockyard Schools to become an artificer.
5. A urologist.