When speaking in English, you often use words that have the same meaning, or synonyms, in order to avoid repetition and make your language sound more varied and interesting. The phrase "bellow out" is often used to describe someone shouting or speaking loudly. There are many other synonyms for this phrase that can be used to enhance your vocabulary and writing. For instance, you could use words like "holler," "yell," "shout," "roar," or "squawk" to describe someone who is speaking forcefully. Alternatively, you could switch things up and use more unusual synonyms like "exclaim," "bark," or "vociferate" to add more color and interest to your language.