I think oxymorons are incompatible opposites, like hmmm ... well, some claim "military intelligence" is an oxymoron, but others would say that's a bad example. How about "warm refreshments"? or "friendly divorce"? or "gourmet glop"? I'm not sure what the term is for those unnecessary repetition ones. There must be a word for them, or maybe their name is some repetetive phrase like "self-referential synonyms". In Norwegian we would say they're like "buttering your bacon". Trek420 said one waaaaayyy back in her toddler years. The mutual brother and I thought it was unfair that the mutual parents weren't keeping a record of her first words as they had ours. By the time we realized this she was talking in full sentences, so we recorded some of her cutest phrases. One I remember was a perfectly correct observation from a stroll out on the chicken farm one day: "There's a dead chicken that died."