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.
cleft clift clafouti cleveite calved klepht claught clavate cleaved califate caliphate coalified
cleft left lefty lift loft aloft fylfot velvet hayloft clift sealift delft