blocker.

Agent noun of block (“obstruct or prevent”); something that blocks something else. One who blocks or impedes the movement of an opponent.

Agent noun of block (“obstruct or prevent”); something that blocks something else. A defensive or low-scoring batter.

Agent noun of block (“obstruct or prevent”); something that blocks something else. One who prevents another user from contacting them electronically.

Agent noun of block (“obstruct or prevent”); something that blocks something else. An application or feature that stops or impedes something.

an ad blocker

a content blocker

Agent noun of block (“obstruct or prevent”); something that blocks something else. A bug or issue that prevents software from being released.

Agent noun of block (“obstruct or prevent”); something that blocks something else. A gatekeeper who refuses the marketer access to the person they wish to contact.

Agent noun of block (“obstruct or prevent”); something that blocks something else. 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.

Agent noun of block (“obstruct or prevent”); something that blocks something else. A close-fitting rectangular glove worn by a goalie in multiple forms of hockey.

Agent noun of block (“obstruct or prevent”); something that blocks something else. A blocker bet.

Agent noun of block (“obstruct or prevent”); something that blocks something else. A playing card, needed by one player, that is held by another.

A person who roughly shapes a diamond.

A person who blocks (stretches or moulds) or more generally makes knitted items, hats, books (or book covers), shoes, etc.

A resident or member of a particular block.

Synonym of block ornament (“a cheap piece of meat of poor quality”).