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.
sketch sketchy seecatch scotch scutch seecatchie scootch skosh scooch sickish
ketch sketch catch catchy cutch gotcha quitch bycatch scootch scotch scutch seecatch sketchy yecch
sake sike skee skew skiey soke syke askew