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.
ghast ghost ghosty fast vast phaseout feast vasty phased fest fist vest
ghast hast vasty haste hasty hest hist cast vast coast last oast mayst pasta pasty sayst tasty toasty wast whist chest yeast maist ghost feast nasty east boast beast baste bast host fast caste gast mast least past paste roast taste toast waist waste chaste shist yeasty