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.
precious precis precieuse precise paresis precess piracies parses prezes prosos prises prases perses proses purses prizes prices pursues presses prosses process praises prisses peruses parises pareses pierces pyrosis prissies prossies peeresses
ferocious veracious voracious gracious precious araceous coriaceous gracioso ceraceous sericeous