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.
aphis aghas aviso aves avos
phis raphis aphis roughies typhus raphias tophus raphes tophes ouphs sophs ouphes scyphus kophs qophs kaphs caphs ephas phiz ghis sophies syphs tophs toughies shivs