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.
costal coastal costally costly coastally castle gustily cussedly
festal distal vestal costal coastal postal acetal costly setal listel beastly stale justle pestle mostly nestle ghastly pistol bustle recital wrastle jostle distil moistly castle steal istle pastel ghostly vastly lastly hostel justly pistil hustle societal osteal mousetail pastil stall rustle wrestle hostly whistle
costa cost costae cast caste coast coesite coset cosied cosset