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

• green algae
• green audit
• green audits
• greenback
• greenbacks
• green-bag
• green-bags
• green ban
• green bans
• green bean
• green beans
• green belt
• green belts
• Green Beret
• green-bone
• green-bones
• greenbottle
• greenbottles
• green card
• green cards
• green cheese
• greencloth
• greencloths
• green-collar
• green corn