class warfare vs class war

class warfare and class war both are nouns.

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

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

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

Other synonyms of class warfare include class struggle.

class warfare (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)