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.
entera enter ender entry endear entire entree endure enduro
entera santera antra haunter montero center bunter pointer painter neuter jauntier contra nittier mantra mintier sinter nutria linter knitter vaunter gnattier punter hunter tenter shunter tantra chaunter wintery sonneteer wanter tinter reenter nettier reuniter daunter nitery niter noter snottier renter nutter santero quainter mounter gaunter canter lintier minter jointer natter saunter hinter inter runtier counter enter paintier cointer netter venter nattier fainter lientery minuter centra keynoter banter nuttier santeria ranter knottier snootier pointier rentier reinter daintier neater taunter knotter tentier uniter snoutier winter chanter tantara chunter yantra