Precipice

n.	1.	A sudden or headlong fall.
	2.	A headlong steep; a very steep, perpendicular, or overhanging place; an abrupt declivity; a cliff. Where wealth like fruit on precipices grew. - Dryden.

Noun

1.

precipice - a very steep cliff

cliff, crag, crest, escarpment, face, hilltop, knoll, lofty peak, mountaintop, palisade, palisades, peak, pic, pico, pike, pinnacle, point, scar, scarp, spur, steep, summit, tor, wall