class struggle vs class war

class struggle and class war both are nouns.

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

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

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

Other synonyms of class struggle include class warfare.

class struggle (noun)	class war (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)