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.
rennin renin reunion renown ronion
rennin tannin bunion quinina guanine kinin anion banian benign gonion aeonian leonine pinion pennine fanion panini ronion munnion eonian nannie wanion nine quinine canine venine mannan inion quinin guanin gunnen conin cannon venin dynein conine linin pennon panino renin onion reunion minion union hyenine
rein renew runny wren arena arene bren erenow frena