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.
santir santur santera santour saunter santoor sandier santero snootier snoutier sanitary santeria snottier sander snider sentry sanitaria sinter sanatoria sanitoria senator sonneteer sundry sonder centre centra center sender sunder zander centare centaur century sounder ceinture centaury
santir entry entire jointer inter taunter center kantar enter vaunter country punter centre cantor mantra mounter bunter gentry hinter gnattier chantor minter reenter shunter chaunter wintry tentier daunter reinter venter rentier wanter linter paintier snoutier fainter santur gaunter sentry quainter snootier pointer contra counter mintier pointier hunter jauntier antre painter mentor cointer banter ranter nattier nittier antra qintar centra tenter intro canter nuttier knottier gantry chantry lintier snottier quintar sinter gauntry saunter nettier daintier pantry winter reentry runtier haunter renter tantra tinter chanter chunter yantra
santo sained saint sand sandy saned sanity saunaed sent sente senti snit snot snotty