Em rhymes with:
alem, behm, bem, blehm, brehm, brem, cardizem, chem, clem, condemn, dehm, demme, emme, femme, fm, gehm, gem, gemme, hem, hemm, hemme, imm, jem, kehm, kem, khem, klem, klemm, klemme, lem, lemm, m, m., mgm, p.m., pgm, phlegm, pm, ppm, prem, rehm, rem, remme, rhem, rpm, schemm, schwemm, stem, stemm, swem, temme, them
Em sounds like:
eamon, ehman, ehmann, ehmen, ein, einon, ema, emina, emma, emme, emmi, emmie, emmy, emu, en, ena, enea, enema, enemy, enman, ennea, ennen, ennui, eno, eon, euan, ewan, ewen, eyman, eynon