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.
parridge porridge parge porridgy perigee purge peerage porgy pirogi
ridge fridge parridge porridge bridge perigee triage drudge dredge porridgy greige marriage grudge carriage ferriage ridgy trudge
parr pariah parry sparrow sparry par