Plain
Nouns
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plain, table-land, face of the country
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open country, champaign country
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basin, downs, waste, weary waste, desert, wild, steppe, pampas, savanna, prairie, heath, common, wold, veldt
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moor, moorland
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bush
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plateau etc. (level) Horizontality
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campagna
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alkali flat, llano
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mesa, mesilla [U.S.], playa
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shaking prairie, trembling prairie
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mead, haugh, pasturage, park, field, lawn, green, plat, plot, grassplat, greensward, sward, turf, sod, heather
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lea, ley, lay
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grounds
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maidan, agostadero.
Adjectives
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champaign, alluvial
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campestral, campestrial, campestrian, campestrine.