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.
spelt split spilt splat spoilt speeled spelled spieled speiled spiled spalled suppled spoiled spilled sepaled spooled sepalled sepaloid spoliate supplied sepiolite
spelt pelt plat plot applet capelet caplet coplot couplet replot ripplet spilt splat split uplit chaplet
spell spale spall speel speil spiel spile spill splay