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.
direct dirked drugget tract darked tricot dragged drouked drugged derogate
coerect erect direct porrect reerect correct market bearcat recut precut preact recto haircut eruct bract recti recta react tract
dirk dreck drecky dreg dreggy drek