Lushun vs Port Arthur

Lushun and Port Arthur both are nouns.

Word	Noun	Adjective	Verb	Adverb
Lushun	Yes	No	No	No
Port Arthur	Yes	No	No	No

As nouns, Lushun and Port Arthur are synonyms defined as:

Lushun and Port Arthur: a major port city in northeastern China on the Liaodong Peninsula; now a part of Luda

Other synonyms of Lushun include Lushunkou District.

Lushun (noun)	Port Arthur (noun)
a major port city in northeastern China on the Liaodong Peninsula; now a part of Luda	a battle in the Chino-Japanese War (1894); Japanese captured the port and fortifications from the Chinese
	a major port city in northeastern China on the Liaodong Peninsula; now a part of Luda