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.
coesites costs coasts castes caestus casitas cuestas casettes caseates casts cassettes cosets guests quests cossets keysets cassatas gazettes gasts gusts kists custos
sites coesites hessites zoisites resites sits jesuits bastes leucites hastes suits castes vestees cites listees sates hostess sties pastes lucites mustees miscites paucities pistes posties recites quaysides cecities visits beasties gaseities wastes cities lawsuits lysates missuits sides besides stews suites gustoes ascites gestes asides mesteso casitas situs daysides testees mestees nasties pasties piosities posits raucities resides resits seasides dacites tastes testes waysides