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.
sharp sharpy sharpie sherpa charpai charpoy chirp chirpy chirrup chirrupy
harp sharp harpy carp carpi tarp warp chirp sharpy
share sharia shariah char chare charr charro charry chary shear sherry shire shirr shore shrew shri