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.
spile spail spale speil spiel spill spoil supple soapily sappily sepal spall speel spell splay spool supply zeppole
pile spile uppile huipil ripple loopily hopple couple pale pele fipple maypole pilei roupily soapily topple maple popple spale people spiel spill supple dapple dipole duple wheeple pili pilea nipple speil spail papule pole apple plew plie ropily plea pily sappily pupil pial happily pule nippily pill pail spoil zeppole diploe dopily tipple peppily cupule choppily