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.
current currant crenate courant courante couranto gurnet carnet cornet coronet coranto crownet guaranty careened grunt grant carronade guarantee garnet craned corned greened crinite crooned crinoid grenade crunode grantee granita crowned cornuto cornute cairned
current horrent torrent rent rente arrant brent errant gerent currant orient parent reorient rerent warrant