There are several synonyms for the phrase "more bigvoiced". Some of the options include louder, more booming, more resonant, more powerful, more thunderous, more sonorous, and more piercing. These words all convey a sense of strength and intensity, which can be useful when describing someone's voice. Depending on the context, different synonyms might be more appropriate. For example, if you wanted to describe someone shouting, you might use "louder". However, if you were describing a singer's voice, you might choose "more resonant" to highlight their vocal ability. Using synonyms can help to make your writing more vivid and interesting, allowing you to paint a more detailed picture for your readers.