The term 'Tree Torso' is composed of two words, 'TRUNK' and 'Tree'. The word 'TRUNK' is a five-letter word which refers to the main stem of a tree. It is the part of the tree that supports the branches and leaves. The word 'Tree' is a four-letter word which refers to a large plant with a woody stem, typically having a single TRUNK and many branches. Together, the two words form the term 'Tree Torso', which refers to the main stem of a tree.