What's the difference between smotherer and stifler?

Smotherer

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Definition:

Example Sentences:

Stifler

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Definition:

• (n.) One who, or that which, stifles.
• (n.) See Camouflet.

Example Sentences:

• (1) Stifler, Ph.D., president, Health Management Resources, Boston.
• (2) Daniel Smith refers to these sufferers as "stiflers".