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.
swales swails seawalls swallows swells swills
whales wales swales bowelless wheals swails hawalas bewails woollies willies wholes whiles wheelless wheelies wellies aweless wayless seawalls wawls wauls walls wallies walies wails wiles woolies weals
swale swallow swail swell swill