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.
devour devoir dyvour defer diver deafer deffer defier defray differ doffer duffer daffier deifier tougher
favour savour dyvour devour bevor favor havior haviour ivory four savior saviour savor savory savoury devoir pavior paviour