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.
welt wilt weld weald wield wieldy willet welled wallet wheeled welladay wild wold waled wiled woald would
belt felt gelt kelt melt knelt pelt celt delt welt