Changjiang vs Yangtze Kiang

Changjiang and Yangtze Kiang both are nouns.

Word	Noun	Adjective	Verb	Adverb
Changjiang	Yes	No	No	No
Yangtze Kiang	Yes	No	No	No

As nouns, Changjiang and Yangtze Kiang are synonyms defined as:

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

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

Changjiang (noun)	Yangtze Kiang (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