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.
ninon
ninon pinon pennon noun pinion panino onion munnion noon quinone gonion kinin cannon ninny nona none renown ronion tenon wanion linin known oniony canon annona bunion fanion fanon phonon inion anon ionone guenon quinin linen minion anion neon reunion xenon union chinone
ninon nine ninny anion annona inion ionone onion oniony pinon union