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.
mortar mortary mortuary moratory martyr moratoria martyry murder mirador marauder murderee
mortar tartar charter tartare sorter martyr darter sirdar sardar porter perter pearter mortary quarter sartor retear curter courter carter hurter barter rotary garter tarter shorter
mort mart moored amoretti amoretto amort