prej·u·dice
? ?[prej-uh-dis] Show IPA noun, verb, -diced, -dic·ing.
noun
1. an unfavorable opinion or feeling formed beforehand or without knowledge, thought, or reason.
2. any preconceived opinion or feeling, either favorable or unfavorable.
3. unreasonable feelings, opinions, or attitudes, especially of a hostile nature, regarding a racial, religious, or national group.
4. such attitudes considered collectively: The war against prejudice is never-ending.
5. damage or injury; detriment: a law that operated to the prejudice of the majority.
rac·ism
? ?[rey-siz-uhm] Show IPA
noun
1. a belief or doctrine that inherent differences among the various human races determine cultural or individual achievement, usually involving the idea that one's own race is superior and has the right to rule others.
2. a policy, system of government, etc., based upon or fostering such a doctrine; discrimination.
3. hatred or intolerance of another race or other races.
Based on the dictionary definition of the two words, racism is just a small form of prejudice: prejudice is all inclusive, racism is just about race.