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.
greasily grassily grisly crazily crassly grossly crusily grizzly gracile grisaille cresol cresyl creosol crossly coarsely crousely curiously carcel
greasily racily rosily brasil brassily horsily crassly crazily crusily grassily parasail prissily prosily pursily dressily drowsily
grease greasy crease creasy gores grass grassy grays grees greys grues egress ogres ogress