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.
boron born bourn brown borne baron boreen barony browny bourne briony borane bren baronne brownie barn bran brin burn bairn briny buran brain brawn barny burin bruin brine barney barren brainy branny brawny burnie byrnie biriani
boron moron krooni cornu groin gyron horny horn iron prion heroin virion heron morn krone corn garron lorn croon whereon hyperon shorn chorion marron corny morrion neuron perron trone crone porno pyrone diuron drown torn hereon irony korun porny groan roan kroon giron born bourn borne crony irone barony baron carrion grown crown loran maroon krona trona durion drone sorn prone porn morion pereon turion mourn frown brown corona worn shoran neurone yourn
bro biro boar boor bora bore borrow bourree broo brow