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.
cheeper cheaper chipper chopper chippier choppier shaper shipper shopper
beeper keeper peeper deeper weeper cheeper heaper hepper leaper leper pepper reaper seepier weepier cheaper per
cheep cheap cheapie cheapo sheep