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.
slipe slip slope slype salpae slippy salp slap slop salep salpa sleep sloop saloop sleepy sloppy
slipe lipe lip slype calipee lope blip blype elope fillip lipa flip calliope clip culpae kelpie slip callipee salpae slope clepe tulip