Roget's Thesaurus

#344. Plain

Nouns

plain, table-land, face of the country; open country, champaign country; basin, downs, waste, weary waste, desert, wild, steppe, pampas, savanna, prairie, heath, common, wold, veldt; moor, moorland; bush; plateau etc. (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.

Adjectives

champaign, alluvial; campestral, campestrial, campestrian, campestrine.