When conveying strength and dominance, sometimes using different words for "most-powerful" can make your writing more interesting and varied. Here are some synonyms to consider: mighty, potent, forceful, influential, dominant, commanding, overwhelming, authoritative, paramount, supreme, invincible, unbeatable, almighty, and prevailing. Each of these words carries slightly different connotations. For example, "mighty" has a more heroic or medieval feel, while "invincible" implies unbeatability. Consider the context of your writing and the impression you want to leave on your readers to choose the best synonym for "most-powerful".