Some of my favorite pairs from the big list:

misrelation / orientalism; superintended / unpredestined; incorporate / procreation (don't mind if i do!); predators / teardrops (a cause and effect); counteridea / reeducation (a bit synonymous); streamlined / derailments (quite opposite!); truculent / unclutter; colonialist / oscillation; renavigate / vegetarian; persistent / prettiness; paternoster / penetrators (hmm); obscurantist / subtractions; nectarines / transience (a story of ripeness); definability / identifiably; indiscreet / iridescent; excitation / intoxicate; discounter / reductions (how logical!)

One small suggestion I have: add a point for pairs with different starting letters, and another point for pairs with different ending letters.