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.
reletter realter relater realtor relator reloader
letter reletter glitter gauleiter clutter flutter fleeter clatter billeter flatter blotter blottier bleater plotter platter blatter belter slitter slotter welter flattery kelter clattery latter muleteer pleater plottier allotter lottery lotter litter littery flitter pelter fluttery cluttery gleetier glittery melter sleetier slittier sluttier shelter
relet realty reeled relate relied relit