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.
trotter troutier triter tarter tartier treater trattorie trattoria darter tartar trader tireder tardier traitor tartare treader torture toreador torrider dirtier
rotter trotter garotter charioteer parroter brattier sorter porter grouter grittier garroter carrotier frotteur fritter frettier fretter router prettier ruttier rooter ritter rioter reutter rattier critter ratter gritter rootier grottier shorter
trot tarot torot trout trouty tottered