der Schlund
gullet
The anatomical area at the back of the mouth and throat that connects the esophagus and the windpipe.
Beim Schlucken gelangt die Nahrung vom Mund in den Schlund.
When swallowing, food passes from the mouth into the gullet.

gullet / abyss
Loading your saved state.
gullet
The anatomical area at the back of the mouth and throat that connects the esophagus and the windpipe.
Beim Schlucken gelangt die Nahrung vom Mund in den Schlund.
When swallowing, food passes from the mouth into the gullet.

'Schlund' (gullet / abyss / maw) is an expressive word that is mostly used in written language, in literary texts, or in technical language (anatomy). It is rather rare in everyday colloquial speech.
Der Dichter beschrieb den dunklen Schlund der Unterwelt.
The poet described the dark abyss of the underworld.
In the anatomical meaning, 'Schlund' (gullet) is used in a medical or biological context. Words like 'Rachen' (throat), 'Speiseröhre' (esophagus), or verbs like 'schlucken' (to swallow) point to this meaning.
Der Arzt untersuchte den Schlund des Patienten auf Entzündungen.
The doctor examined the patient's gullet for inflammation.
In the meaning 'Abgrund' (abyss), 'Schlund' is often combined with adjectives such as 'tief' (deep), 'dunkel' (dark), or 'finster' (gloomy/dark). A typical action is 'in den Schlund zu blicken' (to look into the abyss) or 'in den Schlund zu stürzen' (to plunge into the abyss).
Die Bergsteiger standen am Rande eines tiefen Schlundes.
The mountaineers stood at the edge of a deep abyss.
When it refers to an animal's mouth, it usually means a large or dangerous animal. A typical phrase is that the animal 'seinen Schlund aufreißt' (opens its maw wide).
Das Krokodil riss seinen gewaltigen Schlund auf.
The crocodile opened its enormous maw wide.
neck / throat
'der Hals' and 'der Schlund' can both have to do with the area through which you swallow and breathe. However, 'Hals' is the normal everyday word and often means the front area that hurts when you are sick. 'Schlund' is more precise and technical or more vivid: it means the back area of the mouth and throat. Learners may confuse the words because both are located in roughly the same place in the body. In everyday language, you almost always say 'Hals', for example when talking about pain. 'Schlund' fits better in medical, biological, or dramatic descriptions.

Die Ärztin erklärt, dass der Schlund hinter dem Mund beginnt.
The doctor explains that the gullet begins behind the mouth.
Nach dem kalten Spaziergang tut mir der Hals weh.
After the cold walk, my throat hurts.