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.
stutter stouter stater studier stator sedater staider stature statuary steadier seedeater citator
stutter toter stouter stater betatter touter tottery totter dotter dottier titer tetter tauter tattier tatter tater titter