ferrule /ferˈool, -əl/

1. A metal band, ring or cap on the tip of a stick, etc for reinforcing it
2. A threaded cylindrical fitting for joining two pipes or rods

• Napier's rods
• napiform
• napkin
• napkin ring
• napkin rings
• napkins
• napless
• Naples yellow
• NAPM
• NAPO
• napoleon
• Napoleonic
• Napoleonism
• napoleonite
• napoleonites
• napoleons
• napoo
• napooed
• napooing
• napoos
• nappa
• nappas
• nappe
• napped
• napper