What is another word for "horizontal"?

Roget's Thesaurus (1911) lists these synonyms for "horizontal": abase, abasement, about, accubation, accumbent, adown, all, alluvial, area, azimuth, back, basement, beam, below, bend, beneath, bilge, billiard, board, bob, bow, bowling, bring, butte, calm, cast, cellar, concave, concavity, couch, couchant, courtesy, cower, cricket, croquet, crouch, crouched, curtsy, cut, dash.