Chang Jiang vs Changjiang

Chang Jiang and Changjiang both are nouns.

Word	Noun	Adjective	Verb	Adverb
Chang Jiang	Yes	No	No	No
Changjiang	Yes	No	No	No

As nouns, Chang Jiang and Changjiang are synonyms defined as:

Chang Jiang and Changjiang: the longest river of Asia; flows eastward from Tibet into the East China Sea near Shanghai

Other synonyms of Chang Jiang include Chang, Yangtze, Yangtze Kiang, Yangtze River.

Chang Jiang (noun)	Changjiang (noun)
the longest river of Asia; flows eastward from Tibet into the East China Sea near Shanghai	the longest river of Asia; flows eastward from Tibet into the East China Sea near Shanghai