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.
parure parura parrier parer purer pourer pareira prairie prier prior poorer priory
parure cruor truer dourer sourer ruer burrer frore furore crore rare curare crura curer lurer marrer parura pourer purer surer tourer urare
par pariah sparry para parae pare pareo pareu pair parry parr pear prau pauper spar spare sparrow sprue