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.
sliver salver silver slaver solver silvery slavery salivary sleigher salvor sloughier sulfur sulfury sulphur sulphury
liver deliver sliver lowlifer leafier believer leavier lever leaver gulfier culver bolivar flivver clever plover reliever salver clavier silvery vilifier slavery sloughier nullifier elver lover delver shelver clover cliffier laver louver allover cleaver laveer pullover livier livery livre glover mollifier clovery qualifier wolver delivery liever palaver rollover claver silver fluffier slaver boilover lifer levier solver shelvier
salify saliva salve salvia salvo selva silva silvae slave slavey sleigh slieve solve sylva sylvae