An oxymoron (plural oxymora or oxymorons) is a figure of speech that juxtaposes elements that appear to be contradictory. Oxymora appear in a variety of contexts, including inadvertent errors (such as "ground pilot") literary oxymorons crafted to reveal a paradox, or expressing ideological statements like honest broker, civil war, effective government.

The most common form of oxymoron involves an adjective–noun combination of two words.
For example:
Dark light Crazy wisdom

Less often seen are noun–verb combinations of two words, like in a song title of Simon & Garfunkel's "The Sound of Silence".
One case where many oxymora are strung together can be found in Shakespeare's Romeo and Juliet, where Romeo declares:
O heavy lightness! Serious vanity!
Mis-shapen chaos of well-seeming forms!
Feather of lead, bright smoke, cold fire, sick health!

After a long preamble, please provide some samples to create a list of meaningful oxymora:
• open secret
• organized mess
etc etc