It is termed faucalized because of the stretching of the fauces and visible narrowing of the faucial pillars in the back of the oral cavity.
During faucalized voice, the sides of pharynx expand outward and the larynx descends and tilts forward.
Its opposite is harsh voice, a vocal quality produced when the pharynx is contracted and the larynx raised.
Faucalized voice involves the forward tilting of the larynx which stretches the vocal folds and produces a higher pitch sound, despite the increased volume of the pharyngeal cavity.
Voice quality is also contrastive between singular and plural nouns in Dinka and other Nilotic languages (Nuer and Shilluk), but this relationship is less regular.