Inner Mongolia vs Nei Monggol

Inner Mongolia and Nei Monggol both are nouns.

Word	Noun	Adjective	Verb	Adverb
Inner Mongolia	Yes	No	No	No
Nei Monggol	Yes	No	No	No

As nouns, Inner Mongolia and Nei Monggol are synonyms defined as:

Inner Mongolia and Nei Monggol: an autonomous region of northeastern China that was annexed by the Manchu rulers in 1635 and became an integral part of China in 1911

Inner Mongolia (noun)	Nei Monggol (noun)
an autonomous region of northeastern China that was annexed by the Manchu rulers in 1635 and became an integral part of China in 1911	an autonomous region of northeastern China that was annexed by the Manchu rulers in 1635 and became an integral part of China in 1911