A plughole is an opening through which water or other liquids drain out from a sink, bathtub, or other similar objects. Some common synonyms for plughole include drain, sinkhole, outlet, discharge point, wastewater port, and sewer hole. Other less commonly used alternatives include sluice, spout, culvert, waste pipe, run-off chute, and sump. The term "plug" can also be used as another way to reference the opening where a drain-cover or plug is seated within a plughole--preventing water from entering the trap. When searching for the right word to describe a plughole, it's useful to consider the context and audience to identify the most appropriate term.