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.
laddered laterad laterite lettered littered loitered literate
foddered shuddered doddered juddered laddered chowdered powdered teddered redried metred tiered shattered bittered petered battered buttered steered neutered loitered chittered teredo dared cottered metered mitered bettered pottered gettered lettered mattered shuttered guttered tittered nattered dreed watered littered dried dured muttered teared pattered reuttered fettered dread jittered catered adored puttered uttered deterred tattered teetered tottered waitered chattered odored yattered
ladder lader lauder leader loader bladder bladdery blader gladder