blocker

Short definition from Wiktionary

Noun

1. 1
   Agent noun of block (“obstruct or prevent”); something that blocks something else: One who blocks or impedes the movement of an opponent.
2. 2
   Agent noun of block (“obstruct or prevent”); something that blocks something else: A defensive or low-scoring batter.
3. 3
   Agent noun of block (“obstruct or prevent”); something that blocks something else: One who prevents another user from contacting them electronically.
4. 4
   Agent noun of block (“obstruct or prevent”); something that blocks something else: An application that stops / impedes unauthorised access to a programme.
5. 5
   Agent noun of block (“obstruct or prevent”); something that blocks something else: A bug or issue that prevents software from being released.
6. 6
   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.
7. 7
   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.
8. 8
   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.
9. 9
   Agent noun of block (“obstruct or prevent”); something that blocks something else: A blocker bet.
10. 10
    Agent noun of block (“obstruct or prevent”); something that blocks something else: A playing card, needed by one player, that is held by another.
11. 11
    A person who roughly shapes a diamond.
12. 12
    A person who blocks (stretches or moulds) hats.
13. 13
    A resident or member of a particular block.
14. 14
    Synonym of block ornament (“a cheap piece of meat of poor quality”).

Proper noun

1. 1
   A surname.