Trunk and Tree trunk

Trunk noun - The main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber.

Tree trunk is a synonym for trunk. In some cases you can use "Tree trunk" instead a noun "Trunk".

Tree trunk noun - The main stem of a tree; usually covered with bark; the bole is usually the part that is commercially useful for lumber.

Trunk is a synonym for tree trunk in thing topic. You can use "Trunk" instead a noun phrase "Tree trunk".