I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
seeress seers seres series sers serries suers sires sears sores ceres cereus serous serosa sirees serows sarees zeroes sieurs serais sauries sirrees serious surreys sierras soirees sirs sris soars saris xerus cires ceros sours saros sorus suras soras zeros cerias cerous sirras surahs surras zaires serosae sirrahs sorrows souaris
peeress seeress whereas dressy zeroes seres ceres peres cereus press peeries nereis queries faeries feres tress veeries haeres eyres tressy dress series aeries heiress meres quaeres cressy cress caress heroes heresy heres duress wheres res ers