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.
zilch slatch slouch salchow slouchy
filch zilch milch lich laich lichi loch lych belch caliche moloch culch clach cultch glitch gulch flitch mulch cliche lech welch