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.
sulfur sulfury sulphur sulphury salver salvor silver slaver sliver solver silvery slavery salivary sleigher
sulfur belfry golfer pilfer rolfer sulfury telfer wolfer