blocker

1. One who blocks or impedes the movement of an opponent.
2. A defensive or low-scoring batter.
3. One who prevents another user from contacting them electronically.
4. An application or feature that stops or impedes something. · an ad blocker· a content blocker
5. A bug or issue that prevents software from being released.
6. A gatekeeper who refuses the marketer access to the person they wish to contact.
7. Any of various medications that block (inhibit) the activity of a chemical messenger or its receptors, such as cardiac conduction modifiers (e.g., alpha-blockers, beta-blockers), gastric acid inhibitors (H₂ histamine blockers), puberty blockers, and others.
8. A close-fitting rectangular glove worn by a goalie in multiple forms of hockey.

Plural blockers