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.
saviour savior savour savoury savor savory savvier saver suaver sever safer sofar siver safari severe sigher soever suffer zaffir suffari
haviour paviour saviour favour havior pavior savior savour savoury devour dyvour