The word "rest-room" is typically used to refer to a room where people can rest, relax, and take care of their bodily functions. However, there are many synonyms for this term that may be more appropriate to use in certain situations. Some common synonyms for "rest-room" include "bathroom," "toilet," "washroom," "lavatory," "powder room," "comfort station," and "facilities." Depending on the context and location, some of these terms may be considered more formal or informal, and may be used interchangeably with "rest-room" or not at all. When in doubt, it's always best to use language that is appropriate and respectful to the situation and the people involved.