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.
selfs selloffs selves sulfas sluffs selvas silvas solves sylvas salvos sylphs slaves salves sleighs salivas sloughs sleaves slaveys slieves salvias sulphas sleeves salvoes salifies
pelfs delfs selfs beliefs clefs sulfas leafs alefs alfas alifs rolfs calfs califs golfs gulfs kalifs pilafs reliefs wolfs
self selloff selva sluff sulfa sulfo