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.
natures nitres natters notaries niteries nitros noters niters nadirs nitroso netters nitrous neuters nutters kneaders knitters knotters notarize notorious needers nodders nutrias
futures matures coutures sutures features natures tres daturas quatres trues tyres tires dures retries stores strews mitres treys poetries tress satires steres stoures stress faitours stours waitress tares titres matres viatores trees hauteurs tores trews goitres nitres auteurs votress stares detours metres attires litres mattress tries retires tours duress buttress shoetrees