The word "spewer" is often used to describe someone or something that releases or expels something quickly and violently. Synonyms for "spewer" might include "vomiter," "gusher," "belcher," "regurgitator," "emitter," or "sprayer." Depending on the context, other synonyms like "fountain," "discharger," or "projector" could be used as well. When describing something specific, a more descriptive term like "volcano," "geyser," or "firehose" could be used instead. In any case, it's important to choose the right synonym to accurately convey the intensity and nature of the phenomenon being described.