The best replacement for caldera is crater.

The best alternatives to caldera are rated as following:
★★★★★  crater
★★★★  hot springs
★★★  volcano
★★  sundance
★★  jacuzzi
★★  onyx
★  cinder cone
★  volcano crater
★  bullfrog
★  kula
  colorgate
  cal spas
  sundance spas
  hot spring
  craters

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