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.
spicey spice spicy spacey spies spacy space seapiece specie speise spaes supes spews spays sipes spues sepias sepoys speiss spouse suppose
spicey pacey pice piece apiece coppice kneepiece seapiece spacey spice spicy toepiece showpiece