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.
purism prism porism prosoma parosmia presume
verism lyrism porism prism purism tourism charism chrism verismo heroism dorsum truism charisma chrisma chrisom
puris price spurs spurreys pursy purse purrs paries paris peris pours praise pariahs pricy pricey pries prise priss prissy prize purees purs pursue spurious spurries uprise