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.
shimmy shammy shim chammy chummy shamoy sham shmo chimb chime shame shawm
immy jimmy shimmy gammy dummy rimy pommy mommy emmy hammy gemmy gimme jammy jemmy chummy commy gummy tommy limey limy mammey mammy mummy rammy rummy tammy tummy chammy shammy limby whammy yummy