A oxymoron is a combination of 2 words that seem to be the opposite of each other.
A contradiction is when you say two or more things that cannot both be true.
A fine mess
Agree to disagree
Bitter sweet
Baggy tights
clean toilet
Clear as mud
Dry ice
Devilish angel
Educational tv
Extra ordinary
beacon light of hope
flames of withering injustice
joyous daybreak
long night of their captivity
crippled by the manacles of segregation and the chains of discrimination
A contradiction is when you say two or more things that cannot both be true.
www.oxymoronlist.com
http://www.fun-with-words.com/oxym_explain.html