Chang vs Changjiang

Chang and Changjiang both are nouns.

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

As nouns, Chang and Changjiang are synonyms defined as:

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

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

Chang (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