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.
rennins renins reunions runniness renowns ronions raininess renounce
rennins tannins ronions fanions dyneins reunions renins pennons minions bunions linins quinines kinins ninnies anions banians unions onions nines venines quininas venins canines cannons conines conins guanines guanins inions quinins mannans munnions pennines pinions nannies wanions