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.
precis precise precious precieuse paresis precess piracies parses prezes prises prases perses prices purses proses prizes pursues prosses process prisses presses praises peruses parises pareses pierces pyrosis prissies prossies peeresses prosos
precis farcies pheresis curacies lyricise mercies paresis piracies precise cercis diaeresis dieresis diuresis
pareos press apres purees pries pricy pricey price prez preys prese pares presa prees pores peres pareus pyres sprees