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.
mixed maxed mixt myxoid muckiest muggiest
fixed mixed nixed hexed tuxedo vexed taxed faxed sexed loxed poxed coxed coaxed hoaxed exed boxed axed gussied guised cozied maxed cosied foxed raxed sixte taxied waxed