Eder rhymes with:
cheddar, deader, fedder, feder, fedor, header, leder, lehder, maeder, medar, prijedor, raeder, redder, reder, rehder, schraeder, shredder, spreader, tedder, vedder
Eder sounds like:
eader, eater, eatery, ederer, editor, edra, edrea, either, ether, ethier, etter, eudora