The word trunk has several synonyms which can be used to describe the elongated part of a tree or an elephant's body. The word stem can be used to describe the thick and elongated part of a plant which bears leaves, flowers or fruits. The word bole can also be used to describe the main stem of a tree. Another synonym can be the word log which is often used to describe a piece of a tree that has been cut down. In terms of describing an elephant, the word proboscis can be used to describe the elongated nose or snout of the animal. The word torso can also be a synonym when describing the human body.