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.
ruts routs routes rets rots rats rudds ratos riots rotes writs rites rates rotos rotis roots rotas raitas rottes writes riatas radius reties retuse reatas riotous rods ritz rids rads reds roads raids ritzy redes rodes roods rides redds reads redos reeds
beauts gouts shouts tuts tauts ruts puts outs nuts knouts muts mauts louts guts cuts bouts juts huts phuts ghauts buts pouts routs dauts touts uts shuts