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.
decorous decors decares deckers decrees decries decrease decuries dikers dekares dockers duckers diggers degrees doggers daggers daikers dickers duikers dackers degrease doggeries takers tokers
vigorous rigorous decorous carious carouse crouse curious grouse kouros vagarious vicarious vigoroso nacreous scarious
decor decare decree decry decury