Ironbark is a type of tree commonly found in Australia. It is also referred to as Eucalyptus sideroxylon and is known for its tough and durable bark. When looking for synonyms for the word ironbark, some options include ironwood, gum tree, and eucalyptus tree. These names all refer to trees that have a similar appearance or characteristics as the ironbark tree. Additionally, the term "red ironbark" is often used to specify the specific species of Eucalyptus sideroxylon with a distinct red hue to its bark. Overall, the synonyms for ironbark help to describe the tree and its features in different ways.