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.
castle coastal coastally costal costly costally gustily cussedly
bustle pestle istle wrestle jostle wrastle whistle castle nestle justle hustle rustle style citole beastly coastal moistly misstyle stole festal hostile distil pistil stile pastil settle lastly resettle diastole stale ghastly costly justly hostel bastile pastel eustele mostly stele vestal ghostly hostly restyle costal pistol vastly hypostyle pustule postal listel distal pistole systole
cast caste caseate cased casette casita cassata cassette caused coast cost costa costae gast