The term "cloudbust" is a relatively uncommon word, which means a sudden and violent downfall of a huge quantity of rain or snow. However, there are some synonyms or related words which can be used to express the same meaning. For instance, "downpour," "deluge," "torrential rain," and "heavy shower" all convey the same idea. Other closely related words include "tempest," "storm," "hailstorm," and "monsoon." Using these synonyms provides a variety of words to choose from and helps you to avoid repetition in your writing. In summary, the word "cloudbust" can be substituted with several other words, giving you a broader vocabulary.