Over-nighter is a casual term that refers to spending the night or staying somewhere for a short time. There are several euphemistic synonyms that can be used in place of over-nighter, such as sleepover, slumber party, crash, or crash pad. Other alternatives can be a one-night stand, layover, stopover, or overnight stay. Some more formal and professional terms include stop-in, brief visit, or short-term residency. Whatever the reason for staying somewhere for a short period, there are many different words to describe it without relying on the casual over-nighter. Depending on the context and audience, using a more appropriate term can enhance communication and maintain professionalism.