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

• crown vetches
• crown-wheel
• crown-wheels
• crown witness
• crownwork
• crownworks
• crow-quill
• crow-quills
• crows
• Crows
• crow's-bill
• crow's-feet
• crow's-foot
• crow-shrike
• crow-shrikes
• crow's-nest
• crow-steps
• crow-toe
• crow-toes
• croze
• crozes
• crozier
• croziers
• croûte
• croûtes