Oxymoron - this phrase of two words that contradict each other. Oxymoron serves more expressive imagery and text. Examples: "deafening silence", "living corpse».
Interestingly, the word itself is an oxymoron oxymoron, since the first part of his "oksyu" in Greek means "sharp" and "Moron" - stupid. Allusive oxymoron (οξύμωρον) can be translated as "clever nonsense».