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.
slavey slave sleave salve solve slieve sylvae sleeve silvae selva sulfa silva sylva salvo salify saliva salvia sleigh sulpha sylphy sloughy
slavey lave leave leavy valve halve calve clave cleave glaive salve slave sleave deleave