Yangtze vs Yangtze Kiang

Yangtze and Yangtze Kiang both are nouns.

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

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

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

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

Yangtze (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