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.
testees testes tests testis deists toasts tsetse tzetze testacy dusts tastes tsades tsadis dacites tassets
vestees mustees listees testees mestees coesites bastes nasties hastes pasties resites posties lysates gestes hostess tastes settees testes castes beasties zoisites mesteso suttees sates sties hessites stews pastes gustoes seeds sites reseeds hayseeds pistes wastes
testee test taste teased testa testae testy