How to sign: a deep ravine (usually with a river running through it)
Categories: ravine
Within this category: Cataract Canyon, Grand Canyon, gulch, Olduvai Gorge
How to sign: the passage between the pharynx and the stomach
Similiar / Same: esophagus, oesophagus, gullet
Categories: muscle system, muscular structure, musculature, passage, passageway