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.
swain swan sewan swine seawan swanny swinney swoon swoun sweeny swoony sweeney
wain swain twain win wan swan diwan lawine deewan bwana gowan winy sewan hwan rowan jawan gwine twine wany dewan wean rewan lauwine rawin rewin wine seawan swine wino gowany whin dwine wane twin twiny