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.
gabelle gable gabble cable gobble cowbell cabal coble kibble qabala cabala kabala cobble cabbala kabbala qabalah quibble
belle gabelle bell belie belly abele cowbell labella libelee libellee rubella sowbelly bel