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.
sulfide sulfid sulfite sulphide sulfate sulphid sulphite salified selfed sylvite sluffed sylphid sulphate salivate sleighed salved solved slaved slight salvoed sealift sleaved sleeved sleight solvate