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