currajong vs bottle-tree

currajong and bottle-tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
currajong	Yes	No	No	No
bottle-tree	Yes	No	No	No

As nouns, bottle-tree is a hypernym of currajong; that is, bottle-tree is a word with a broader meaning than currajong:

currajong: widely distributed tree of eastern Australia yielding a tough durable fiber and soft light attractively grained wood; foliage is an important emergency food for cattle
bottle-tree: an Australian tree of the genus Brachychiton

Other hypernyms of currajong include bottle tree.

currajong (noun)	bottle-tree (noun)
widely distributed tree of eastern Australia yielding a tough durable fiber and soft light attractively grained wood; foliage is an important emergency food for cattle	an Australian tree of the genus Brachychiton