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.
costae costa cost coesite caste coast coset cosied casita cuesta cosset cassata caseate casette cast cassette cased caused cozied cussed goosed gooiest
costae testae fiesta sade vesta staw stay site lysate mustee misate pasta pastie setae costa caste peseta casita postie hosta cesta visaed zoisite haste testa testee waste seta cuesta fossate geste baste stoae beastie listee moste mestee passade coesite paste sate stey cassata pesade piste hessite resite vestee siesta vista taste fissate stoa stew tsade chaste
cos coos cosey cosie coss cosy cows coys cogs