Oxymoron - an epigrammatic effect, by which contradictory terms are used in conjunction: living death ; fiend angelical.
The most common form of oxymoron involves an adjective-noun combination of two words. Dark light and Living dead
Less often seen are noun-verb combinations of two words, such as the line "The silence whistles"
Oxymorons are not always a pair of words; they can also be devised in the meaning of sentences or phrases.