What is another word for "plane"?

Roget's Thesaurus (1911) lists these synonyms for "plane": accubation, accumbent, all, alluvial, area, asomatous, astral, azimuth, back, beam, billiard, board, body, bowling, butte, calm, couch, couchant, cricket, croquet, dead, decumbence, decumbency, decumbent, discoid, discumbency, disembodied, disembody, down, ego, esplanade, estrade, even, extramundane, fell, flat, flatness, flatten, floor, flounder.