Nullarbor Plain vs champaign

Nullarbor Plain and champaign both are nouns.

Word	Noun	Adjective	Verb	Adverb
Nullarbor Plain	Yes	No	No	No
champaign	Yes	No	No	No

Nullarbor Plain (noun)	champaign (noun)
a vast arid plain of southern Australia stretching inland from the Great Australian Bight; has sparse vegetation and no surface water and is almost uninhabited; the site of a major rocket research center	extensive tract of level open land