What is another word for "bottom"?

Roget's Thesaurus (1911) lists these synonyms for "bottom": about, affiance, air, airy, anastrophe, anchor, and, anticipation, aspiration, assumption, assurance, back, balance, balm, base, baseboard, based, basement, basis, beam, become, before, belief, below, bilge, bit, blue, box, bright, built, buoyancy, candle, capsize, cart, centerboard, cheer, clear, cloud, come, commonalty.