There are many words that can be used as synonyms for the phrase "attack violently". Some of the most commonly used ones include assault, pummel, thrash, beat, pounce, bludgeon, batter, strike, hammer, and assail. Each of these words conveys a different level of aggression and force, with some being more violent and aggressive than others. When choosing a word to use in place of "attack violently", it is important to consider the context of the situation and the tone of the writing. Some words may be more appropriate for describing a physical altercation, while others may be better suited for describing a verbal or emotional attack.