Port Arthur vs Lushunkou District

Port Arthur and Lushunkou District both are nouns.

Word	Noun	Adjective	Verb	Adverb
Port Arthur	Yes	No	No	No
Lushunkou District	Yes	No	No	No

As nouns, Port Arthur and Lushunkou District are synonyms defined as:

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

Other synonyms of Port Arthur include Lushun.

Port Arthur (noun)	Lushunkou District (noun)
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
a major port city in northeastern China on the Liaodong Peninsula; now a part of Luda