What is another word for "plummet"?

Roget's Thesaurus (1911) lists these synonyms for "plummet": abysmal, and, angle, angles, ankle, azimuth, bathometer, bathymetry, benthal, beyond, bolt, bottomless, cast, circle, cliff, cock, concavity, crater, deep, deepen, deepness, depression, depth, dig, draught, earth, elevation, end, endwise, erect, erection, erectness, excavate, fathom, fathomless, gulf, head, heave, hell, hollow.