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.
scotch scootch scooch scutch seecatch scotia sketch seecatchie sketchy skosh sickish squoosh squooshy
scotch scootch sketch seecatch scutch scooch bycatch quitch gotcha ketch cutch couch cooch coach catchy catch sketchy