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.
roble rouble ruble rabble robalo rubble rebel rubel rebill reboil rubbly rubella rubeola
coble noble roble labile blew bole rabble jubile blue gable able cable viable hobble kibble lobule boule gobble nobble nobly nubile obole rouble ruble sable suable dibble doable double tabooley wabble nebule blae abele bubale diobol dobla seeable dabble rubble ciboule cobble feeble mobile liable habile bubble fable tubule table bobble bible babble foible nibble quibble bale bile nubble obol pebble bauble gabble wobble