class war vs class struggle

class war and class struggle both are nouns.

Word	Noun	Adjective	Verb	Adverb
class war	Yes	No	No	No
class struggle	Yes	No	No	No

As nouns, class war and class struggle are synonyms defined as:

class war and class struggle: conflict between social or economic classes (especially between the capitalist and proletariat classes)

Other synonyms of class war include class warfare.

class war (noun)	class struggle (noun)
conflict between social or economic classes (especially between the capitalist and proletariat classes)	conflict between social or economic classes (especially between the capitalist and proletariat classes)