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.
rubel rubella rubeola rebel ruble rouble rubble rubbly roble rabble rebill reboil robalo
rubel bel doubly bell abele babel bauble bubal jebel label cowbell libel obeli rebel rouble ruble double tubal
rube rub robe rubby ruby grub grubby krubi drub