fastener
nounUK /ˈfɑːsənə/
US /ˈfæsənər/
A thing that holds parts together, like a button or a zipper.
She used a fastener to close her coat.
OTHER MEANINGS
2. A device such as a bolt or screw used to join materials.
The worker tightened the fastener on the metal frame.
3. A person or thing that makes something secure or fixed.
The knot acted as a fastener for the rope.
4. A zipper or similar closure on clothing or bags.
The fastener on my backpack broke, so it won't stay shut.