The best replacement for buffet is sideboard.

The best alternatives to buffet are rated as following:
★★★★★  sideboard
★★★★  server
★★★★  sit down
★★★  plated
★★★  sit down wedding
★★★  hutch
★★★  buffet
★★★  ala carte
★★  selmer
★★  sit down meal
★★  yamaha clarinet
★  smorgasbord
★  dresser
★  stations
★  seated dinner
★  seated dinner wedding
★  plated dinner wedding
★  sit down dinners
★  credenza
★  bellagio buffet
★  golden corral
  plated wedding
  family style
  buffet dinner
  plated for wedding dinner
  plated dinner
  buffett
  plated wedding dinner
  catering
  leblanc
  continental breakfast
  console
  high tea
  sit down reception

Your alternative for buffet is not listed? Suggest!
Speaking about buffet, one probably shouldn't forget about hutch.

Other search terms related to buffet and their ratings are:
★★★★★ hutch
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Google Trends

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buffet
sideboard
server