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.
soudans soutanes sedans suddens soddens stuns satins stains stanes setons stones suddenness soddenness seitans sadness sateens saddens stannous sootiness seediness cytons stance stanza steins stenos cetanes zeatins
soudans dans dawns deans boudins voudons loudens medians radians redans sedans dedans udons