racism vs discrimination

racism and discrimination both are nouns.

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

As nouns, discrimination is a hypernym of racism; that is, discrimination is a word with a broader meaning than racism:

racism: discriminatory or abusive behavior towards members of another race
discrimination: unfair treatment of a person or group on the basis of prejudice

Other hypernyms of racism include favoritism, favouritism.

racism (noun)	discrimination (noun)
discriminatory or abusive behavior towards members of another race	unfair treatment of a person or group on the basis of prejudice
the prejudice that members of one race are intrinsically superior to members of other races	the cognitive process whereby two or more stimuli are distinguished