Bivvy is a word commonly used in outdoor recreation and camping. However, there are other words that can be used to describe this type of shelter. Some possible synonyms for bivvy include a camping tent, a bivy sack, a shelter, a lean-to, a tarpaulin, a poncho tent, or a survival shelter. Each of these words conveys a similar concept to bivvy, but with slight variations in style and function. For example, a camping tent may be larger and more structured than a bivy sack, which is often lightweight and more portable. Using synonyms can add variety and clarity to your writing or conversation, allowing you to describe a bivvy or similar shelter in different ways.