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.
welch welsh
belch welch lych gulch culch clach caleche fletch fleech fleche filch bleach leach moloch lich letch leech lech cultch milch mulch zilch loch pleach welsh
weal weel well wellie welly swell dwell