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.
short shorty shortie shirt shirty shored sheroot sherd chert shred shard chord chart shaird shared chored shrewd cherty shroud sheared shirred choroid choired cheroot sheered chariot charity choreoid chorioid shrewdie
short whort ort chart torot aorta sorta sort port mort korat court hart hurt forty bort fort boart dorty tort torte forte torta wort chert shirt borty chord shorty
shore chore chorea share sharia shariah sherry shire shirr shoer shrew shri ashore