problem vs race problem

problem and race problem both are nouns.

Word	Noun	Adjective	Verb	Adverb
problem	Yes	No	No	No
race problem	Yes	No	No	No

As nouns, race problem is a hyponym of problem; that is, race problem is a word with a more specific, narrower meaning than problem:

problem: a state of difficulty that needs to be resolved
race problem: a social and political problem caused by conflict between races occupying the same or adjacent regions

Other hyponyms of problem include balance-of-payments problem.

problem (noun)	race problem (noun)
a source of difficulty	a social and political problem caused by conflict between races occupying the same or adjacent regions
a question raised for consideration or solution
a state of difficulty that needs to be resolved