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.
lipase lips lapse laps lops lapis leaps loops lopes loups lupus loupes lupous
pase lipase pas tepas spays depose sepias spaes reoppose repays pawpaws popsie papas pappose paws apse dopas chuppahs nappas kapas pays cowpeas copays appease huppahs apace pose pias pease peas opahs pass pause paise appose bypass cuppas paseo capias kappas nipas napas koppas passe lapse oppose pace copse papaws paps poppas pupas repass repose space spas suppose diapause tapas upas chuppas
lipa lip lipe lippy blip flip flippy clip slip slipe slippy