Synonyms to mean sea level

parterre, auditorium, balcony, billiard table, bowling green, box, box seat, dead flat, dead level, dress circle, earth, esplanade, fauteuil, flat, flatland, floor, gallery, ground, homaloid, horizontal, horizontal axis, horizontal fault, horizontal line, horizontal parallax, horizontal plane, horizontal projection, ledge, level, level line, level plane, loge, nigger heaven, orchestra, orchestra circle, paradise, parquet, parquet circle, peanut gallery, pit, plain, plane, platform, prairie, proscenium boxes, sea level, sea of grass, stall, standing room, steppe, table, terrace, theatre stall, water level, Autobahn, US highway, alley, alleyway, arterial, arterial highway, arterial street, artery, autoroute, autostrada, avenue, belt highway, blind alley, boulevard, bypass, byway, camino real, carriageway, catafalque, causeway, causey, chaussee, circumferential, close, corduroy road, county road, court, crescent, cul-de-sac, dais, dead-end street, dike, dirt road, drive, driveway, emplacement, estrade, ex