champaign vs llano

champaign and llano both are nouns.

Word	Noun	Adjective	Verb	Adverb
champaign	Yes	No	No	No
llano	Yes	No	No	No

As nouns, llano is a hyponym of champaign; that is, llano is a word with a more specific, narrower meaning than champaign:

champaign: extensive tract of level open land
llano: an extensive grassy and nearly treeless plain (especially in Latin America)

Other hyponyms of champaign include flat, flood plain, floodplain, moor, moorland, peneplain, peneplane, snowfield, steppe, tundra.

champaign (noun)	llano (noun)
extensive tract of level open land	an extensive grassy and nearly treeless plain (especially in Latin America)