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.
appal appall appeal appel apple apply appellee apollo
appal pal pawl paly pall pale pail copal peal nipple pupal pipal reapply ripple sepal spale supple dapple tepal topple opal appall pial papal appel apple apply fipple hopple keypal appeal nopal popple rappel repeal ripply spail spall supply tapalo tipple typal