Formal/Scientific:
* Esophagus: This is the most accurate scientific term for the gullet.
* Pharynx: This refers to the throat, which includes the gullet, but is a broader term.
* Food pipe: This is a more informal, but still common term for the gullet.
Informal/Figurative:
* Throat: This is a more general term that can also refer to the voice box.
* Swallowing passage: This describes the function of the gullet.
* Tube: This is a simple and informal term for the gullet.
The best word to use will depend on the specific context and the desired level of formality.