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.
sanitary sanitaria sentry santir santur sanitoria santero sandier saunter santoor santera santour santeria centaury sanatoria sundry sander snider sinter centare centaur century senator snoutier snottier snootier centaurea sonneteer center centre sender sonder sunder zander
sanitary unitary nitery notary vanitory gyniatry qintar quintar monetary monitory punitory centaury wintry
sanity snit saint santo seniti