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.
rapid raped rapped reaped repaid rapt wrapped riped roped wrapt repped ripped rouped
vapid rapid sapid tepid spied caped lipide lipid leaped gaped copied reaped cupid japed lipoid pied raped paid repaid heaped poppied soaped apod taped aped shaped
rap crap drapey grapy grappa grapey grape crappy crappie crape frappe rape frap wrap rupiah reap rappee drape trap