So whats the difference between an OXYMORON and a PARADOX?

paradox such as the time traveler paradox- one cannot kill his grandmother in the past because if he did so his mother would not be born and so on. oxymoron biggie smalls, fatboy slim. the way i see it a paradox differs from an oxymoron in the fashion that its not literally contradictory but it asks questions that only receives questions so its never truly answered.