What is another word for "floor"?

Roget's Thesaurus (1911) lists these synonyms for "floor": accubation, accumbent, adown, all, alluvial, area, azimuth, back, base, baseboard, based, basement, basis, beam, bed, below, beneath, bilge, billiard, board, bottom, bowling, built, butte, calm, cellar, centerboard, coat, concave, couch, couchant, course, cover, covering, cricket, croquet, crouch, crouched, cut, dado.