The word "boab" is a bit tricky because it is a regional term for a type of tree found primarily in Australia. However, there are some synonyms that can be used to describe this unique plant. In some regions, the boab tree is called a "baobab" or "dead-rat tree" because of the shape of its fruit. The local Aboriginal people also refer to the boab tree as "larrgadiya" or "garrgadiya". Other descriptive words that could be used to describe the boab tree include "stout", "chunky", or "bulbous", due to its distinctive shape and size. Ultimately, the term boab is best used when discussing this particular type of tree, rather than attempting to find precise synonyms.