different between facesitting vs smothering

English

face +? sitting

facesitting (uncountable)

(BDSM) The sexual practice of sitting on a partner's face to receive cunnilingus or anilingus.

smothering

smothering (plural smotherings)

The act by which someone or something is smothered.
- 2010, Harry Hill, Livin' the Dreem: A Year in My Life (page 397)
  When he came to, he begged me not to tell the hotel management, as his last two attempted smotherings had ended in failure and he was worried about losing his job.

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