Cannoning is a term that describes the action of shooting or firing a cannon. If you are looking for synonyms for this word, there are a few options to consider. "Blasting" is a strong synonym that can be used to describe the same action. "Firing" is another common word that is synonymous with cannoning. Additionally, you might use the word "shelling" which describes the process of shooting artillery or bombs from a distance. Other words that are similar in meaning include "bombarding," "attacking," and "assaulting." Regardless of which synonym you choose, they all convey a sense of force and power.