paradox — something absurd or contradictory: a statement, proposition, or situation that seems to be absurd or contradictory, but in fact is or may be true. oxymoron — expression with contradictory words: a phrase in which two words of contradictory meaning are used together for special effect, e.g. "wise fool" or "legal murder". More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.