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.
showers shewers chawers chewers
vowers mowers knowers towers bowers lowers showers sowers powers dowers cowers rowers wooers shewers hewers chawers rewears gnawers ewers pawers wears tawers viewers sawers sowars swears twiers weirs chewers sewers jowars