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.
aper apery appear apiary aporia
hyper japer chipper hopper keeper copper weeper zapper mapper hoper peeper leaper lipper dapper quipper paper piper hooper gaper cooper wrapper raper ripper whopper yauper shaper cheaper whipper topper sipper caper super shopper reaper napper tipper gypper diaper loper doper mopper taper hipper gipper bopper roper per coper gawper hepper popper pauper lapper deeper looper pepper aper heaper moper zipper whapper cupper kipper viper chopper sapper leper rapper riper tapper knapper duper lopper dipper beeper toper nipper yapper wiper supper capper soaper upper whooper cheeper shipper yawper