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.
spoilt spilt spoiled spelt splat split spoliate spiled sepiolite spilled speiled spieled spooled sepaloid sepaled spalled speeled spelled suppled sepalled supplied
spoilt pilot piolet poult copilot spilt
spoil spail speil spiel spile spill spool espial