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.
rudds redds readds rods ruts rids rads reds reeds redes roads redos routs raids roods rides reads rodes retuse redias rodeos radius radios routes redoes readies riotous roadeos roadies rowdies rats rets rots
rudds sudds kiddos kudos kudus quids lauds leuds guids nudes mauds readds caddis gauds redds suds dads dudes udos ouds gudes gaddis quads bauds adds judos judas fuds feuds puds buds quods leudes ludes muds odds cuds sudsy duads duds yauds
rudd ruddy redd rude rued crud cruddy crude prude