Yangtze vs Chang

Yangtze and Chang both are nouns.

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

As nouns, Yangtze and Chang are synonyms defined as:

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

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

Yangtze (noun)	Chang (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