Roget's Thesaurus of English Words and Phrases by Peter Mark Roget

champaign country†; basin, downs, waste, weary waste, desert, wild, steppe, pampas, savanna, prairie, heath, common, wold†, veldt; moor, moorland; bush; plateau &c (level) 213; campagna†; alkali flat, llano; mesa, mesilla [U.S.], playa; shaking prairie, trembling prairie; vega [Sp.]. meadow, mead, haugh†, pasturage, park, field, lawn, green, plat, plot, grassplat†, greensward, sward, turf, sod, heather; lea, ley, lay; grounds; maidan†, agostadero†. Adj. champaign†, alluvial; campestral†, campestrial†, campestrian†, campestrine†.