Greenpeace rhymes with:
altarpiece, centerpiece, crosspiece, eyepiece, masterpiece, mouthpiece, showpiece, timepiece, allweiss, altarpiece, buslease, centerpiece, crosspiece, eyepiece, irianese, legalese, masterpiece, mouthpiece, petrosynthese, sangiovese, showpiece, sublease, syntheses, timepiece, viennese
Greenpeace sounds like:
greenback, greenback's, greenbacks, greenbush, greenpeace's, grownups