Rat-a-tat-tat is a word used to describe a series of quick, sharp sounds. There are several other words that can be used as synonyms for rat-a-tat-tat, including tap-tap-tap, knock-knock-knock, rattle, and drumming. These words are often used to describe the sound of a drumming bird or a woodpecker, as well as the sound of someone knocking on a door or tapping their fingers on a table. The use of these synonyms can add variation and interest to writing, and help to create a more vivid and descriptive scene. It's important to choose the right synonym, depending on the context and the intended tone of the writing.