Sperm rhymes with:
affirm, berm, confirm, ferm, firm, germ, germe, herm, hurm, infirm, long-term, reaffirm, reconfirm, schirm, squirm, sturm, term, therm, thurm, worm, wurm
Sperm sounds like:
sabourin, sabrina, saffran, saffron, safran, savarino, schiferon, schizophrenia, seaborn, seaborne, severin, severini, severino, severn, shafran, shakespearean, shifrin, shopworn, siberian, sophronia, soprano, sovran, sparano, spearman, sporn, sprain, spreeman, spreen, spurn, subramanian, suffern, superhuman, superman, superwoman, superwomen, supreme, sybron, szafran