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.
sips sipes sops zips saps sups spas soups spaes spays supes spews spies seeps spues soaps speiss spouse sepoys sepias speise hyssops suppose ceps spaz zaps zeps space spacy spazz spice spicy
hips sips ships chips whips tips dips zips rips gips pips nips mips lips quips kips yips