The term "red-top" can refer to a variety of things, including news publications, medical tubes, and even plants. Therefore, there are a multitude of synonyms for the term depending on the context. For example, some synonyms for a "red-top" news publication could be tabloid, sensationalist, or scandal sheet. In relation to medical tubes, a "red-top" could also be called a serum separator tube or clot activator tube. When referring to plants, a "red-top" could also be known as red fescue or creeping red fescue. It's important to consider the context when searching for synonyms to ensure the proper term is used.