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.
start strut sturt stearate strata strati stared street strait stretto strette striate starred striata stretti saturate seatrout stride stroud stored sturdy strode steered steroid stirred storied citrate satyrid stretta sutured stereoed hysteroid
start tart dotard strut ritard retort retard petard outtrot leotard attrit trot tret tort tarty tarot dart sturt whittret
star stare starry strawy astray straw stroy story striae storey strew stray stir store stereo stere stair sitar satara stria strow sutra estray