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.
sepal spail spale spall spool spoil splay spill spiel spell speil speel supply sappily soapily zeppole zeppoli
sepal tepal pal typal deeply paly tapalo spall spail repel peal reply repeal pipal peepul pale pall pawl pail appal appall appeal copal keypal nopal opal papal pepla pial pupal spale wheeple
spa seep seepy sepia sepoy spae spay