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.
ghost ghosty ghast foist fossate fossette phaseout fast fest fist vast vest
host ghost ghosty ghast foist boost boast cost hast oast most posit roast roset doest toast whist chest lost hist hest moist hosta joist joust coast coset costa hoist moste oust post roost roust dost tost wost shist