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.
ref reef reif reefy reify rif rev raff ruff rive riff rave rife rove roof reave revue raphe reive reeve ruffe raffia raphae reavow review roofie