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.
clefs calfs califs calves claves clevis cliffs cloves cleaves golfs gulfs coalifies clavus gliffs gloves kalifs kloofs caliphs clivias cloughs glaives qualifies
clefs alefs wolves delves sulfas selves salves reliefs pelves kalifs gulfs golfs calves califs calfs helves halves valves elves beliefs alifs alfas leafs pelfs pilafs rolfs selfs solves delfs wolfs shelves