tipcover
nounUK /ˈtɪpˌkʌvə/
US /ˈtɪpˌkʌvər/
A tipcover is a small cap that goes on the end of something to keep it safe.
She put a tipcover on her pencil so it would not poke through her bag.
OTHER MEANINGS
2. A removable cover placed over the tip of a tool or pen to protect it.
He lost the tipcover of his favorite pen.
3. A protective sleeve fitted over the pointed end of an object.
The tipcover kept the sharp point from damaging the box.
4. A small shield that covers the end of a nozzle or spout.
Screw the tipcover back on the glue bottle after use.