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.
sylvin sylvine sylvan silvan sloven sulfone sulphone
kelvin sylvin diluvion levin alevin alluvion alvine elfin flavin olivine flavine pluvian pulvini silvan sylvan sylvine diluvian tailfin
sylvae sylva salve salvia salvo selva silva silvae slave slavey solve sylph sylphy