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.
splat spilt spelt split spoliate spoilt sepiolite spiled spalled suppled spoiled speiled sepaled spilled speeled spelled spooled spieled sepalled sepaloid supplied
plat splat uplit depilate appellate populate oppilate pelt plait plate platy pleat plot palate replot applet caplet coplot copulate couplet cupulate papillate replate ripplet spilt epilate spelt split toeplate chaplet
splay sepal spail spale spall spell spile spill