An explosion is an instance of violent release of energy. Antonyms for this word would include synonyms for calm, peaceful, and non-violent. Examples of antonyms could include words like calmness, tranquility, serenity, and stillness. Other options could include adjectives such as gentle, quiet, subtle, and controlled. Additionally, words that suggest containment and confinement might also make effective antonyms for the word "explosion" such as imprisonment, restriction, and repression. While there are many different options to choose from, it is clear that antonyms for the word "explosion" should focus on ideas of peace and control rather than chaos and destruction.