There are several different synonyms that could be used to describe a cup containing poison. Some of the common terms that are often used include poison chalice, toxic vessel, poisonous goblet, venomous cup, lethal mug, deadly receptacle, and hazardous drinkware. These phrases can be used interchangeably to describe a cup or container that is holding a poisonous substance, and they can be used in a variety of different contexts, including literature, movies, and real-life situations. Whether you are trying to describe a dangerous situation or simply looking for a different way to describe a cup containing poison, these synonyms can be a useful tool for writers and storytellers alike.