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.
seedy seed sued stey stewy suety setae soddy suede suttee settee sad zed set sod sty sett stew side suet cede stay cete said sate site soda sidh cedi sadi sade sudd seta seat
needy reedy weedy seedy deedy queued weed reed teddy cooeed need deed eddy kneed seed ready neddy peed feed beady jeed beedi geed heed heady meed feued teed leady