Though "flatuses" may not be a commonly used word, it refers to the release of gas from the digestive system through the rectum. Antonyms for this word could be words that relate to a lack of gas or flatulence. Some words that could be considered antonyms may include "constipation," "obstipation," or "inhibition." These words indicate a state of reduced or blocked gas release, which is the opposite of flatuses. Other antonyms may be "calmness," "relaxation," or "serenity," as these words suggest a state of emotional tranquility without the discomfort or embarrassment associated with flatulence.