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.
swells swills seawalls swallows swails swales
swells dwells wells towels seawalls rowels newels knawels jewels bowels swills wills wheals weals walls wallas dowels vowels wheels twills