What is another word for "plumb"?

Roget's Thesaurus (1911) lists these synonyms for "plumb": abysmal, air, alley, and, angle, angles, ankle, azimuth, bar, bathometer, bathymetry, benthal, beyond, blind, block, blockade, bolt, bottomless, bung, button, caecal, caecum, cast, choke, circle, cliff, clinch, close, closure, cock, concavity, constipation, contraction, cork, corner, cram, crater, cul-de-sac, dam, deep.