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.
goutily gaudily godly cutely goodly guttle cattily quietly coattail coitally coital cuddly cuttle cattail cuittle
goutily fattily wittily tautly doughtily stilly ruttily pettily outlay nuttily nautili nattily knottily mutely meatily gaudily cutely cattily haughtily futile rutile sootily dottily tattily utile chattily til
gout gouty agouti agouty got gut