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.
savours saviours savors savouries saviors savories savorous savers sivers severs sofars safaris suffers suffaris sighers spheres syphers zaffars zaffers zaffirs
favours savours devours dyvours fours bevors favors haviors haviours paviors paviours saviors saviours savors devoirs
savour savoury savior saviour savor savory