Fauces

n. pl.	1.	(Anat.) The narrow passage from the mouth to the pharynx, situated between the soft palate and the base of the tongue; - called also the isthmus of the fauces. On either side of the passage two membranous folds, called the pillars of the fauces, inclose the tonsils.
	2.	(Bot.) The throat of a calyx, corolla, etc.
	3.	(Zool.) That portion of the interior of a spiral shell which can be seen by looking into the aperture.

Noun

1.

fauces - the passage between the back of the mouth and the pharynx

passage, passageway