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.
slavery slaver silvery salver silver sliver solver salivary salvor sulfury sleigher sulphury sloughier sulfur sulphur
slavery laveer laver leaver leavier livery flavory claver clavier cleaver clovery palaver salver silvery slaver delivery
slave slavey salve sleave solve