The best replacement for lesson is moral.

The best alternatives to lesson are rated as following:
★★★★★  moral
★★★★  blessing
★★★  lessen
★★  blessing quote
★  in the lesson
★  lecture
★  theme
  sermon
  regular lesson
  leason
  traditional lesson
  procedural lesson
  tutorial
  critical thinking lesson
  long lesson

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Speaking about lesson, one probably shouldn't forget about laughter.

Other search terms related to lesson and their ratings are:
★★★★★ laughter
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lesson
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