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.
strep stirp strap strip strop satrap stripe stripy satrapy stirrup strappy stroppy
strep tarp trap trip trop atrip rattrap satrap stirp strap strip strop
strew star ester asteria sutra strow stare starry steer stere stereo stir store storey story straw strawy stray stria striae stroy aster astray estray