Final answer:
The word that can be used as a synonym for "trunk" (n.) when referring to the human body is Torso.
Step-by-step explanation:
The word that can be used as a synonym for "trunk" (n.) when referring to the human body is Torso. The torso refers to the main part of the body, excluding the head, neck, and limbs. It includes the chest, abdomen, and back.