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.
spouse suppose spues soups sepoys speise spas sups sops saps sips spies sipes spays spaes space spice soaps supes spews spacey specie speiss spicey hyssops
spouse coups depose copse roups repose pappous pappoose papoose opus oppose lupous loups coypous pause pious copious appose posse pose poise pappose reoppose repousse soups suppose diapause