Buller is a versatile word with a range of synonyms depending on the context in which it is used. In the sense of a noise or loud sound, it can be replaced with terms like roar, rumble, thunder, or cacophony. If used to describe a young bull, synonyms might include calf, steer, or heifer. In a more figurative sense, as in someone bullshitting or talking nonsense, synonyms might include bluster, bluff, or exaggerate. Alternatively, in Australian slang, "buller" can mean to search for gold, with synonyms being prospecting or fossicking. Ultimately, the appropriate synonym for "buller" depends on the intended meaning and use in the sentence.