General Synonyms:
* Resolution
* Conclusion
* Outcome
* End
* Finale
* Climax (though this usually refers to the peak of tension, not the resolution)
More Formal Synonyms:
* Catastrophe (used in classical literature)
* Epilogue (used in literature, often referring to a brief section after the main story)
Other Options:
* Unraveling
* Unfolding
* Revelation (if the denouement involves a big reveal)
* Twist (if the denouement is unexpected)
The best synonym to use will depend on the specific context of the story or situation you are describing.