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.
seawan sewan swan swain swanny swoon swoun sweeny swoony sweeney
jawan seawan wan diwan deewan swan hwan wain wane wany wean bwana gowan rowan sewan swain gowany dawen rawin dewan rewan twain