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.
cosset coset cost coast costa cassette costae gusset cosied cussed caseate casette coesite cassata cast caste cased casita cozied cuesta gassed goosed caused keyset kissed gaseity gooiest guessed gussied
asset russet basset misset tasset cosset knesset gusset posset set seta dossed dissed sett messed moussed bossed reset reseat russety jessed mossed mussed peseta suet sassed misseat tossed coset chassed fessed hissed guessed cessed massed cussed disseat bussed keyset bassett beset pissed gassed missed kissed seat psst passed fussed sussed miseat biassed wissed roset yessed
coss cos cassia coos cosey cosie cosy cows coys cuss cusso koss cogs