Nei Monggol vs Inner Mongolia

Nei Monggol and Inner Mongolia both are nouns.

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

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

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

Nei Monggol (noun)	Inner Mongolia (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