Dalian vs Dairen

Dalian and Dairen both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dalian	Yes	No	No	No
Dairen	Yes	No	No	No

As nouns, Dalian and Dairen are synonyms defined as:

Dalian and Dairen: a port and shipbuilding center in northeastern China on the Liaodong Peninsula; now a part of Luda

Other synonyms of Dalian include Talien.

Dalian (noun)	Dairen (noun)
a port and shipbuilding center in northeastern China on the Liaodong Peninsula; now a part of Luda	a port and shipbuilding center in northeastern China on the Liaodong Peninsula; now a part of Luda