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.
spices spaces seapieces species speises speisses sepses sepsis spazzes spouses spacious specious supposes
apices spices coppices toepieces posies lapises paces peaces peises pieces poesies poises species poussies puces papacies gipsies gypsies capizes kneepieces popsies spaces speises pussies seapieces tapises biopsies showpieces
spicey spice spicy sepias space spacey spacy specie speise speiss spies aspis espies