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.
shirt shirty short shorty shaird shortie sheroot shirred sherd shard chart shred chert shored shrewd shared cherty shroud choired sheared sheered chaired chariot charity cheroot chirred shrewdie
shirt airt virtu hart hurt girt quirt lirot dirt dirty whort chart chert shirty short
shirr shire chiro chirr chirre chiru share sharia shariah sherry shier shore shrew shri ashier