plain vs steppe

plain and steppe both are nouns.

Word	Noun	Adjective	Verb	Adverb
plain	Yes	Yes	Yes	Yes
steppe	Yes	No	No	No

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

plain: extensive tract of level open land
steppe: extensive plain without trees (associated with eastern Russia and Siberia)

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

plain (noun)	steppe (noun)
a basic knitting stitch made by putting the needle through the front of the stitch from the lefthand side	extensive plain without trees (associated with eastern Russia and Siberia)
extensive tract of level open land

plain (adjective)	steppe (adjective)
not elaborate or elaborated; simple
lacking patterns especially in color
free from any effort to soften to disguise
clearly revealed to the mind or the senses or judgment
not mixed with extraneous elements
lacking embellishment or ornamentation
lacking in physical beauty or proportion

plain (verb)	steppe (verb)
express complaints, discontent, displeasure, or unhappiness

plain (adverb)	steppe (adverb)
unmistakably (`plain' is often used informally for `plainly')