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.
space spacey spice spaes spacy spicey specie spas spaz seapiece spues spies sipes spazz spews spicy spays supes sepias speise speiss spouse suppose ceps saps sips sops sups
pace apace space pacey pacy pase peace pice puce coppice lipase papacy spacey spacy spaes spice