This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A high, steep, or overhanging face of rock.

n. A vertical (or nearly vertical) rock face.

n. Obsolete form of clef.

n. A high, steep rock; a precipice.

n. See clef.

n. The steep and rugged face of a rocky mass; a steep rock or headland; a precipice.

n. A variant of clef.

n. The strata of rock above or between the strata of coal.

n. Hard chalk.

n. a steep high face of rock

"Here what they call a cliff was a crumbling bank of whitey-brown earth not fifty feet high."

geological formation    formation   

cliff glacier    french cliff   

clef   

precipice    crag   

cliff swallow    cliffhanger    cliff-face    cliffy   

precipice    crag    steep    heugh    heuch    Linn    scaur    scarf    palisade    perpendicular   

Biff    Riff    biff    dif    diff    griff    hieroglyph    if    riff    skiff   

ridge    mountain    rock    crag    peak    bluff    valley    ledge    boulder    beach