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.
nighties nights naughties knights nifties naiveties naughts noughts naivetes neophytes navettes
eighties righties naughties nighties fifties suavities geophytes safeties ophites fatties footies aphides nifties mephitis neophytes oophytes levities raphides cavities naiveties softies lefties zoophytes
night nightie nighty knight neighed nighed