noun (n)

• a person who stifles or smothers or suppresses

  orang yang stifles atau smothers atau meredam

  Example:
  He is a real conversation stifler.
  

  Synonym:
  smotherer
  

  source: wordnet30
• One who, or that which, stifles.

  satu yang, atau itu yang, stifles.

  source: webster1913