A blow-up bed is a useful piece of furniture for guests, camping trips, or as a temporary solution when moving. However, there are several other words you can use to refer to it. Inflatable mattress is a popular synonym, as it highlights the fact that the bed can be filled with air and then deflated for storage. Another synonym could be airbed or air mattress, which implies the same feature. A third option could be a portable bed, which captures the idea of the bed being lightweight and easily transportable. Finally, an alternative for 'blow-up bed' could be a camping cot, a term used more often when referring to fold-out beds used by outdoor enthusiasts.