racism vs racial discrimination

racism and racial discrimination both are nouns.

Word	Noun	Adjective	Verb	Adverb
racism	Yes	No	No	No
racial discrimination	Yes	No	No	No

As nouns, racism and racial discrimination are synonyms defined as:

racism and racial discrimination: discriminatory or abusive behavior towards members of another race

Other synonyms of racism include racialism.

racism (noun)	racial discrimination (noun)
discriminatory or abusive behavior towards members of another race	discriminatory or abusive behavior towards members of another race
the prejudice that members of one race are intrinsically superior to members of other races