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.
slype slipe slope salpae salp slap slip slop salep salpa sleep sloop saloop sleepy slippy sloppy
blype slype lipe lope elope clepe clypei culpae kelpie polyp polypi salpae slipe slope