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.
penniless painless paneless pinnules pinoles penalise penalize panels pineals
penniless kinless veinless hyphenless finless boonless moonless rainless reinless awnless seniles sonless zoneless toneless wineless tuneless chenilles innless painless gainless paneless lineless hymnless maneless manilles manless nounless gunless boneless runless sinless sunless downless townless winless unless chinless nils