Western world vs Occident

Western world and Occident both are nouns.

Word	Noun	Adjective	Verb	Adverb
Western world	Yes	No	No	No
Occident	Yes	No	No	No

As nouns, Western world and Occident are synonyms defined as:

Western world and Occident: the countries of (originally) Europe and (now including) North America and South America

Other synonyms of Western world include West.

Western world (noun)	Occident (noun)
the countries of (originally) Europe and (now including) North America and South America	the countries of (originally) Europe and (now including) North America and South America